Sleep Timing Disorders & More Laws of Photobiology

More Laws of Photobiology

by Madelyn Griffith-Haynie, CTP, CMC, ACT, MCC, SCAC
Part III of a three-part article in the Sleep Series
Click HERE for Part II

pdclipart.orgLET’S REVIEW what we learned in Parts I and II:

• Time cues are what keep our body clocks aligned with the rest of our 24 hour world.

• In order for our sleep-wake timing to cooperate with our planet’s day/night cycle, our biological clock seems to need regular environmental time cues — like sunrise, sunset, and/or a stable sleep-wake routine.

• The successful shifting of “native” circadian rhythms to those that coordinate with earth’s 24 hour day is calledentrainment.”

• One of the most important reasons for regulating our sleep schedule is to stabilize the quality of LIGHT to which we are exposed.

• In order for work-arounds (and treatment protocols) for circadian/chronorhythm dysfunctions to be successful, it is helpful to understand and cooperate with what are sometimes referred to as the basic laws of photobiology.

Photobiology is the scientific study of the interactions of light (technically, non-ionizing radiation) and living organisms.” ~ Wikipedia

• Visible Light Regulates — The therapeutic effects of light depends upon the wavelength transmitted to the brain through the eye’s retina — visible light is the primary regulator of the human circadian response.

• Only light that is absorbed will have an effect — and it matters what kind of light is absorbed when.

Visible light is absorbed through through chromophores in the retina.

It “communicates” with the body through two primary pathways to the brain from the retina to the optic nerve: one that governs visual perception and response, and the other that governs “neuro-behavioral” responses, along with hormonal and circadian functions.


• Circadian entrainment is most sensitive to stimulation from light in the blue spectrum, but until 1998, Science had no idea how that happened.

LINK DENSE: links are dark grey to reduce distraction potential, turning red on mouseover
Hover before clicking for more info

Artist/educator Phillip Martin

Courtesy of artist/educator Phillip Martin

Extra, Extra – Read All About It:
Non-visual photoreceptor discovered!

Among neuroscientiststs (with implications for those of us with sleep timing dysregulations and disorders), the 1998 discovery of a non-visual photoreceptor was HUGE: a chromophore they named melanopsin [Opn4].

Also used for transmission of rod-cone light information, human melanopsin cells are located in front of the retina.

They communicate with the brain and body through the retinohypothalamic tract
(and don’t you just LOVE an 8-syllable first name?!)

Governing circadian, endocrine, and neurobehavioral functions, this tract was discovered to be most sensitive to blue light stimulation—energy in the wavelength of about 459–485 nm. [nm=nanometer – one billionth of a meter].

And Suddenly Things Were Different

The 1998 discovery of this new photoreceptor, especially sensitive to blue spectrum light, revolutionized the way science thought about how circadian rhythm is entrained, the physiologic effects of light, and especially about light in the blue spectrum.

Researchers subsequently discovered that almost half of the axons from melanopsin cells – around 40% – project to “the human master clock,” the SCN (suprachiasmatic nucleus) – which makes possible an internal “sense of time” as well as regulating the timing of the sleep cycle and hormone secretions.

The remaining connections project to the brainstem, amygdala and the cerebral cortex, in regions believed to be important for the following:

  • the cognitive functions of language, analytic thought, and memory consolidation
  • the speed of circadian re-entrainment
  • light’s effects on activation levels, emotional responses, sleep and hormone regulation
Image by Kent Thune

Image by Kent Thune

Ahem!  Does anybody ELSE notice more than a bit of an overlap between ADD/EFD struggles and the areas of melanopsin regulation?

STAY TUNED for an article on Irlen Syndrome that will explore this idea futher.

More on Melanopsin

Although melanopsin is chemically unrelated to the hormone melatonin (which we’ll get to in a minute), both are involved in regulating the light/dark entrainment that we call our circadian rhythm.

  • Our circadian rhythm governs the production of specific responses in the brain and in the endocrine system, especially those that regulate behavioral and physiological circadian effects frequently associated with melatonin alone.
  • Melanopsin is most sensitive to blue spectrum light [Lok, Corie (20 January 2011), Nature Nature 469 (7330): “Vision science: Seeing without seeing”] — meaning light in the blue spectrum range, whether it “looks” blue to us or not.

BlueLightPlanetThat makes perfect evolutionary sense; earth’s DAYLIGHT is blue spectrum light.

It is also the spectrum of light that best penetrates through the depths of the ocean, believed to be our evolutionary source.

Melanopsin-containing ganglion cells exhibit both light and dark adaptation – they adjust their sensitivity according to the presence or absence of light as well as the kind of light to which you have been exposed recently. Rods and cones respond similarly.

  • Rods and cones are responsible for the brain’s analysis of images,
    patterns, motion and color
  • According to a number of studies, melanopsin-containing ganglion cells
    contribute to various reflexive responses of both brain and body to the
    presence of daylight.

hallucinations_SachsSo, thinking about the points immediately above . . .
maybe we can begin to develop a theory that could help explain

  • why sleep deprivation (or chronic lack of sleep due to disturbed chronorhythms) might result in hallucinations
    (described in Health, Success and Successful Sleeping)
  • and also the increase in clumsiness and accidents due to slowed physical response and visual misperceptions.

The light sensitive cells of our bodies aren’t able to continue to do their jobs effectively when our exposure to the light/dark cycle shifts, because the spectral quality of the LIGHT changes.

You may have heard that it would promote drowsiness to dim the lights as bedtime approaches, but that’s only part of the story — and since the entrainment effect of most artificial light is less robust, it is not likely to be particularly helpful for chronorhythm restabilization.

Interesting side note: Dopamine is a factor in the regulation of melanopsin.*

DopamineDopamine is one of the neurotransmitters whose bioavailability is increased by the stimulant medication prescribed for ADD.

That might offer an explanation for the assertions of many ADDers (myself included) that their quality of sleep is improved by substances that keep so-called “neuro-typicals” awake.
*[Sakamoto K, Liu C, Kasamatsu M, Pozdeyev NV, Iuvone PM, Tosini G. Dopamine regulates melanopsin mRNA expression in intrinsically photosensitive retinal ganglion cells. Eur J Neurosci. 2005; 22: 3129–3136.]

The Miracles of Melatonin

Melatonin is a hormone produced by our pineal gland. It seems to work its magic on that area of the brain that is believed to be the internal timing regulator that governs the daily cycle: the SCN (suprachiasmatic nucleus).

Melatonin signaling forms part of the system that regulates our sleep–wake cycle, initiating drowsiness through a chemical process that lowers our core body temperature slightly.

Core body temperature is strongly correlated with alertness. In laboratory tests, peak efficiency seems to occur when body temperature is its highest [Kleitman, 1963].

In sleep-normal individuals, body temperature is at its highest in the early afternoon and evening, slowly beginning to fall at the onset of darkness in preparation for sleep, in concordance with cortisol production.

We begin to feel drowsy in response to that drop in internal body temperature. In sleep-normal individuals, body temperature is at its lowest somewhere between three and four in the morning, beginning to rise again in preparation of awakening.

OpenClipart 2.0


So it’s not that hot bath that makes it easier to fall asleep,
it’s the
drop in body temperature once you get out of that hot bath.

It also explains why people get better quality sleep when their
bedroom is cool, and why they sometimes have trouble sleeping
in the heat of summer.

Endogenous melatonin (natural, body-produced melatonin) is inhibited by light to the retina, only beginning to rise in the evening — as the light grows increasingly dimmer.

  • Low melatonin levels in the daylight means it doesn’t interfere with daytime alertness.
  • The higher levels after dark promote drowsiness at night.

In an individual with a regulated day/night sleep cycle, melatonin levels rise about two hours before an expected sleep period, are high during sleep and are lowest during the daylight.

According to the phase response curve for human melatonin response
(i.e., a graph of the effect of light at different times of day and night):

It is principally blue spectrum light [460 to 480 nm], that suppresses melatonin.

Although melatonin secretion can be blocked by exposure to most bright light during normally dark times, light that contains wavelengths greater than 530 nm does not seem to have the suppression effect, even in bright-light conditions. [Kayumov et al.]

More Melatonin, please

In some people, small amounts of melatonin supplementation about two hours before the time you need to fall asleep has been known to advance the circadian clock, promoting earlier sleep and facilitating awakening earlier in the morning (around 0.3 mg is often suggested for Jetlag).

Even that may not work very well unless you change the type of light hitting your retinas for those two hours before bed-time (so no computer work and no TV for many of you, if you expect to be able to fall asleep earlier).

Don’t try this at home!

Unless you check with a sleep-literate doctor, you really don’t want to play around with melatonin supplementation long-term or at increased dosages.

There are risks and contra-indications that are beyond the scope of this article – auto-immune response can be altered, rheumatoid arthritis can be exacerbated, in combination with certain medications there is an increased risk of blindness, for example.

According to a comprehensive paper for Fordham University by Joan Roberts**

“Melatonin is a safe and effective supplement when taken in small quantities (Wurtman et al., 1963a, b; Arendt, 2005) and when the person taking melatonin avoids intense sunlight (Wiechmann et al., 2008).

However, precaution should be taken if melatonin is used by those at risk for asthma, as it has been associated with increases in asthma symptoms (Sutherland et al., 2003).”


Jilagan, Openclipart 2.0



DID YOU KNOW that the light coming from our computer screens is in that alerting, melatonin-supressing blue spectrum?

THAT’s why you keep hearing the advice to avoid late-night computer work if you expect to drift off to sleep easily – it’s confusing to your chronorhythms to be exposed to blue spectrum light waves after dark.

Many television sets emit blue spectrum light as well, by the way, so those of you who have your TV in your bedrooms aren’t doing yourselves any favors, even if you don’t look at it directly.

Incandescent light bulbs — the “old” kind they are about to force us to jettison to conserve energy — emit relatively little blue light, so as long as you still have one of those in the lamp beside your bed, reading yourself to sleep is a much better idea!

Late night computer users:
I was recently made aware of something else that might positively affect the ability to fall asleep easily for some of you, even if you’re unable to stay away from that computer — from a doctor who is following the sleep series (perfectly safe but not well-known or understood, so controversial) stay tuned for a post about that in the future.

Speaking of Blue Spectrum Light . . .

SadLossof Incandescent

CFL light bulbs – the “twisty” compact florescent lamps –
make use of blue spectrum light in their energy-saving strategy.

The short wavelength of blue light is perceptually “brighter” than light in other spectral ranges, which is why it takes less energy to produce a perceptually similar amount of illumination.

The bluer the CFL the more energy efficient, so
guess which ones we’ll be exposed to most often?

By the way, the “daylight” CFL bulbs have the bluest color balance (true of most “daylight” bulbs generally)

So for some of you they might be a good choice for the kitchen, helping you come to alertness as you make your morning coffee
(as long as you stay out of the kitchen after dinner!)

Oh please, NOT florescent

Historically, many of us in the “alphabet disorders” tribe (as well as the learning disabilities and sensory defensive communities) have NOT responded well cognitively to florescent light of any type, so the enforced change in the delivery of artificial light is not at all good news for a great many of us.

Perhaps those of us who are sensitive will have to resort to wearing orange-tinted glasses indoors every afternoon and evening – like the ones that dentists use to block out the higher intensity blue light used to “harden” certain almagem materials — and we’ll have to pay the freight for white-light halogens in our own living spaces.


When it comes to ocular light perception, glare and brightness are functions of wavelength

HeadlightGlareThat bluish light from high-intensity headlamps, for example, is great for the driver because it is so bright.  Unfortunately, it also creates glare for oncoming traffic.

Heads up, Baby Boomers

As more and more people make the switch to the brighter, cheaper headlamps, it will be particularly hard on older drivers.

As we age, our eyes tend to be more sensitive to glare,
with less effective night vision.

NOT good news for anyone who may already have trouble driving at night — especially if they are also finding it difficult to fall asleep ALREADY!

Relative effectiveness is important

“Effectiveness” means, in this case, whether or not it will produce a particular biological response – for our purposes, entrainment – and it applies to both natural or artificial sources.

That means that, while the “brightness” or intensity – the “photopic illuminance” – of the light certainly has an effect, to measure light’s effectiveness more specifically, the “action spectrum” must be determined more specifically, and the light energy that is emitted in that region must be measured.

Which means that much of the “Bright light/Dim light” information you read is giving you only a portion of the picture. 

Many sleep scientists consider terms like bright light, dim light, continuous light, and continuous dark “biologically irrelevant,” since they believe that indoor, artificial light sources have little or no irradiance in the spectral region that is most important for entrainment.

Others cite studies that indicate that any light at night can disrupt sleep cycles in ways that alter entrainment periodicity.

My personal experience is that it depends on the sleeper.

  • Once I fall asleep, I sleep SO deeply that I have found that I often get better sleep on nights I fall asleep in the middle of a book, “old-style” bedside lamp still burning — if waking refreshed, more easily than usual, and hearing the alarm for a change are reliable indicators.
  • Light sleepers would probably have the opposite response, especially if the lights left on were CFLs.
  • In any case, when reading reports of a clinical trial involving human response to light, look for a description of the spectral properties of the light source as well as the total irradiance before you take it as gospel.


As long as you avoid the alerting blue-spectrum light, run it through your own “one-rat study” before you make up your mind about how night-time artificial light affects YOU.

Those of us with “alphabet disorders” tend to respond a-typically to a LOT of things.

• Timing matters

The exposure to the spectrum of light present at different times of day produces different shifts in human bodily processes.

The spectrum of natural light from 6-9 in the morning is not the same as the spectrum of light in the late afternoon and early evening. These changes in the vibrational frequency of visible light modify our hormonal response, especially the cycle of our melatonin and cortisol production.

Sleep scientists know that, when conducting a clinical trial involving human response to light, it is important that they track and report the time of day of exposure as well as the total spectrum of the light source.

That is how they came to understand that blue light exposure in the evening is disruptive to human health, possibly as a result of its disruptive effect on sleep quality — and that exposure to the same frequency of light in the early morning has positive health effects, most probably for a similar reason.

Time_FliesWith a sleep-wake schedule that is regular and predictable, most bodies adapt.

When you get off-phase by frequent changes in your sleep-wake timing, where is your body going to go for entrainment to any schedule?

And so you experience problems falling asleep, staying asleep, and waking when you need to — which dominoes into more of the same.

Light is reflective

Reflective properties matter more than you might think, because it changes relative effectiveness.

The amount of light that reaches the human eye depends upon the reflective properties [reflectance] of the surfaces it is bouncing off — so the direction of the light (and the total reflective light from all surfaces in the area reaching the eyes of the test subjects) is also important for any sleep study that attempts to determine the effect of the intensity of ocular light exposure.

Due to the way our eyes are shaped, the direction of the light also determines light intensity.

Scientists have discovered that horizontal illuminance (the measurement of the intensity of light source) received by a sitting subject won’t have the same intensity as the illuminance of the same light source located directly above a patient on a sick bed.

Controlling what we CAN

Since it is logical to assume that those of us experiencing trouble with sleep timing might well be unusually sensitive to the effects of certain light wavelengths and intensities, if you have chronic sleep troubles, think about the surfaces bouncing light around you.

  • Sliney, 2005, determined that sand, snow and water offer the greatest light reflectance — which could affect the sleep schedule of those of you who ski, race dune-buggies, or surf in the early evening, long after it might seem that the light was growing dim enough to initiate your melatonin production, inhibiting it instead (so you don’t get the same call for sleep).

The exercise itself has a positive effect on sleep onset,
but why fight it with increased evening light exposure?

  • Pechacek et al., 2008, tell us that, in an enclosed environment (like in your bedroom?), the surfaces of the walls, floors and furnishings determine the light intensity reaching your eyes.

So think about using matt, light absorbing, choices for items in the room where you plan to sleep, and the opposite for breakfast rooms and kitchens, where you are trying your darndest to wake up.

Every little bit we can do for ourselves to improve the quality of our sleep can help.

The better we sleep, the greater the positive effect on our daytime functioning — which, in turn, has positive effects on our ability to fall asleep at night. And so it goes!

Articles to come will explain more about sleep timing basics, and will continue to review the basics of sleep and sleep stages, which will underscore the importance of allowing yourself enough time to cycle through them all (and explain WHY some days are harder to manage than others). So stay tuned.

**Primary source for the Laws of Photobiology:
Circadian Rhythm and Human Health,
a paper by Joan E. Roberts, Fordham University. Department of Natural Sciences

Other References for the Sleep Series

Rhythms of Life, Russell G. Foster and Leon Krietzman
The Promise of Sleep, William C. Dement and Christopher Vaughan
Evaluation and Management of Sleep Disorders,
third edition, Martin Reite, John Ruddy, and Kim Nagel

As always,
if you want notification of new articles – in the Sleep Series, or any new posts on this blog – give your name and email to the nice form on the top of the skinny column to the right. (You only have to do this once, so if you’ve already asked for notification about a prior series, you’re covered for this one too) STRICT No Spam Policy

HOWEVER you do it, stay tuned — there’s A LOT to know, and a lot more to come. Get it here, while its still free for the taking!

If you’d like some one-on-one (or group) coaching help with anything that came up while you were reading this article (either for your own life, that of a loved one, or as coaching skills development), click the E-me link <—here (or on the menubar at the top of every page) and I’ll get back to you ASAP (accent on the “P”ossible!)

Other Related Articles here, adding context to this post

BY THE WAY: I revisit all my content periodically to update links — when you link back, like, follow or comment, you STAY on the page. When you do not, you run a high risk of getting replaced by a site with a more generous come-from.

About Madelyn Griffith-Haynie, MCC, SCAC
Award-winning ADD Coach Training Field founder; ADD Coaching field co-founder; [life] Coaching pioneer -- Neurodiversity Advocate, Coach, Mentor & Poster Girl -- Multi-Certified -- 25 years working with EFD [Executive Functioning disorders] and struggles in hundreds of people from all walks of life. I developed and delivered the world's first ADD-specific coach training curriculum: multi-year, brain-based, and ICF Certification tracked. In addition to my expertise in ADD/EF Systems Development Coaching, I am known for training and mentoring globally well-informed ADD Coach LEADERS with the vision to innovate, many of the most visible, knowledgeable and successful ADD Coaches in the field today (several of whom now deliver highly visible ADD coach trainings themselves). For almost a decade, I personally sponsored and facilitated seven monthly, virtual and global, no-charge support and information groups The ADD Hours™ - including The ADD Expert Speakers Series, hosting well-known ADD Professionals who were generous with their information and expertise, joining me in my belief that "It takes a village to educate a world." I am committed to being a thorn in the side of ADD-ignorance in service of changing the way neurodiversity is thought about and treated - seeing "a world that works for everyone" in my lifetime. Get in touch when you're ready to have a life that works BECAUSE of who you are, building on strengths to step off that frustrating treadmill "when 'wanting to' just doesn't get it DONE!"

14 Responses to Sleep Timing Disorders & More Laws of Photobiology

  1. Pingback: Dangers of exposure to ‘white’ light / ‘White’ light suppresses the body’s production of melatonin « Health Research Report

  2. Erich says:

    BTW, for those not fully versed in your personal lingo, what’s an ‘Alphabet Disorder’? Shorthand for ‘ADD/ADHD/EFD/whatever they’re calling attentional problems this year’, maybe?


    • Thanks for asking. Excellent guess – very close – but *much* BROADER.

      Alphabet disorders refer to ANY of the disorders usually “nicknamed” with letters of the alphabet that have executive functioning deficits [EFD] which *usually* include specific attentional dysregulation components that might as well be diagnostic ADD in terms of affect.
      BELOW from link ==> ABOUT Alphabet Disorders:

      There is a long list of brain-based disorders that are accompanied by difficulties with the volitional regulation of many of the processes of higher-order cognitive control.

      A great many of them are referred to by acronyms, officially or by nickname – OCD, ODD, SPD, ASD, PDA, PDD, MDD, MS, TBI, ABI, EFD, PTSD, etc. – alphabet disorders! (links to these initials in the post itself)
      For future perplexities: know that I usually try to remember to link to articles explaining my usage of various coinages. Links here are subtle so those who struggle with reading aren’t continually distracted, but if you run your cursor over anything that looks lighter than it’s surrounds (or not!), they’ll jump out at you – red and underlined.

      BTW – When works “normally,” links will open in a new window or tab, depending on how your browser is set – but sometimes the WdPrs guys update and don’t test — then screwy things happens on various blogs, so pay attention (you MAY have to use your browser’s back button or you’ll have to hunt for the original article again)

      For OTHER inquiring minds who want to know: I’ve edited the links at the bottom of the above article — click on one of these (from “Related Content” above – not in this comment):
      • ABOUT Alphabet Disorders
      • Alphabet Soup
      • Variations on ADD-ADHD
      • Looking through The ADD Lens™
      • Symptoms of Attentional Struggles


  3. Erich says:

    Thanks for all this informative stuff, MGH- lack of sleep is a huge health (esp. mental health) issue. I have read (in a compendious book on sleep pathology, “Lights Out”) that there are even photosensitive cells in our skin; a study found that artificial light exposure on the back of the knee caused measurable suppression of melatonin production. Another good reason to make our bedrooms like a bat cave!


    • Ahhhh – a fellow READER! Thank you so much for reading HERE — and especially for taking the time to comment. UNFORTUNATELY, even “huge health (esp. mental health) issue” – in this case – is an understatement.

      You are so RIGHT about the skin/light photosensitivities – and so much more needs to be done about checking out the implications of that research.

      BUT, sleep science is still pretty much in the “dark ages” in that a relatively limited number of “experts” know SO much more than the sleep doctors in the trenches, who can be **decades** behind the latest science.

      Even worse, if current stats continue, the “doctor down the street” won’t catch up for another 15-20 years — the current time it takes for studies to make it through the killing fields of Journal Publishing landmines so enough first-line science writers pick it up and get published somewhere science geek bloggers read regularly … yada, yada .. and FINALLY you see it on TV news as if it were brand new, and STILL there will be docs who are clue-free and will tell patients something obsolete. (Crazy, huh?)

      Bat caves? Great idea for *most* folks, but some of the chrono-kiddos who sleep TOO deeply might find that sleeping in a room with a bit of light actually helps (me, for example). Exposure to gradually increasing AM light makes it easier for *most* people to wake up (new alarm clocks use this realization) – but for “co-sleepers” who don’t want to awaken when their partners do, it can be a problem. Back of the knee alarms, anyone?

      Thanks again for ringing in. Do you blog or publish where I can return the favor? Leave me links (one “live” link per comment or you run the risk of getting “autospammed” – but you can sneak more through in “code” i.e., link name (at) etc. – I can then edit and put them back together so they “click.”)


  4. andy wolmer says:

    life changing


  5. andy wolmer says:

    very well written


  6. Pingback: The Trials and Tribulations of Engaging Learning In An Owl With PDA | Pathological Demand Avoidance Syndrome an autistic spectrum disorder

  7. janesherwin says:

    I only have a small following but I will definitely be promoting your sleep articles as aggressively as possible. I will also join the membership group and check out the video that you suggest. Your blog has really helped my understanding of Mollie, thank you. xxxx


    • You are MOST welcome – that’s WHY I write.

      Your blog has GREATLY enhanced my working understanding of A LOT of things, btw – lots of links to you coming up on articles in draft – and when I have time to house-keep my side-bar, you’ll be there as well.

      WE are the ones we’ve been waiting for (bummer, huh?)



  8. janesherwin says:

    Reblogged this on Pathological Demand Avoidance Syndrome an autistic spectrum disorder and commented:
    If you are, like me, experiencing sleep disorders with your children then please read this post. This explains so much, not just about how different light affects the sleep process but so much more as well. Fascinating stuff !!!!


    • Thank you. I SO appreciate help getting the word out that this content is available. God bless you!

      (LOVE your affirming comments too — wind beneath my wings)


  9. janesherwin says:

    this is fantastic stuff, I think you have just solved my daughters sleep issues for me. She doesn’t produce enough melatonin to start off with and she is prescribed it by our doctor. In the uk we are experiencing longer brighter days at the moment and she has been receiving loads of daylight until later on into the day. She is on her ipad or computer constantly meaning she is overexposed to blue light as well. She has Irlen syndrome to boot and so already processes things differently. BOOM !!!! sleep disorder, do you think that all of this blue light could be making the symptoms of these neurological conditions worse also i.e behaviour, attention and so on and do you think it may also affect neurotypicals ???


    • be right back — Sorry – lose posts if I don’t do it this way
      The few studies that have been done on blue light have been on NTs – so yes, it affects us all. (NASA involvement bodes well, btw – researching to support the upcoming Mars mission)

      My POINT is that those of us with atypical neuro-presentations are more vulnerable, and more easily destabilized, sometimes in ways that set the results in concrete. And it pains me to report that my sleep posts haven’t gotten much readership so far (compared to the popular series like TaskMaster™ etc.)

      If you haven’t already, check out the Dement video link (on one of the other posts – the one in this article is on Melanopsin – I’ll link it to the bottom of this comment as soon as I can spare the time).

      The Dement Video is positive, informative and fun, but the fact that the guy is in his eighties (8 – 0 !) demonstrates the extent of the problem – and how very much work still needs to be done to piggyback on his lifetime quest to get sleep info OUT there.

      DO sign up for membership with the one-year old Chronorhythm Disorders non-profit (links on the post announcing their existence -I’ll come back to put it here as well, as soon as I have some time left in my day after the other to-do stuff).

      They need NUMBERS to report to the other sleep non-profits, who aren’t so eager to include those of us with sleep TIMING issues.

      Thanks so much for YOUR interest (and comments) – so appreciated.

      UPDATE: Click HERE for link to article about CSDN non-profit website – to read or to join – links to more on that article

      ====>Tribute VIDEO to Dr. William Dement by Stanford University – interesting & entertaining history of the sleep field – begins immediately, turn down your speakers!



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