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The Night Shift · Sleep hygiene myths

Half of what you were told is decoration

Last reviewed: July 2026
The short answer

"Sleep hygiene" is a genuine set of habits — but as a treatment for real insomnia it is weak on its own, and clinical guidelines do not recommend it as a standalone therapy. Meanwhile several of its most-repeated rules are overstated or simply wrong. The list below sorts what holds from what does not.

Read this first

This wing explains the science of sleep. It is not medical advice, and it cannot diagnose or treat anything. We give no dosages and recommend no supplements or medications — those decisions belong with a doctor or pharmacist who knows your history. If sleep problems persist for weeks, if you stop breathing or gasp in your sleep, if you fall asleep during the day without meaning to, or if poor sleep is affecting your mood or safety, please speak to a doctor. Sleep problems are common, treatable, and worth taking to a professional.

What actually holds up

  • A consistent rise time. The single most useful lever, because it anchors the circadian clock. More important than a consistent bedtime.
  • Morning light. Free, powerful, and reliably sets the clock.
  • A cool, dark, quiet room. Body temperature must drop to initiate sleep.
  • Bed is for sleep. Genuinely effective — it is a core component of CBT-I, not decoration.

What is overstated

  • "Blue light from screens is destroying your sleep." The effect of typical evening device light on melatonin is real but modest — and considerably smaller than the popular claim. What keeps you up is more likely what you are doing on the device: the argument, the doomscroll, the work email, the cliffhanger. Engagement is more arousing than photons.
  • "Everyone needs exactly 8 hours." Need varies, and most adults fall in a range (commonly cited as roughly 7–9 hours) rather than at a magic number. Rigidly chasing a target is itself a documented route into insomnia — and true "short sleepers" who genuinely thrive on very little are far rarer than the number of people who claim to be one.
  • "Never nap." Short early-afternoon naps are fine for most people and can be restorative. Long or late naps can eat into that night's sleep pressure — which matters most if you already have insomnia.
  • "Sleep hygiene will fix your insomnia." This is the big one. For clinical insomnia, hygiene advice alone is not an effective treatment, and being told to try harder at it can add guilt to an already anxious relationship with sleep. CBT-I is what guidelines recommend.
The honest summary

Sleep hygiene is good housekeeping, not medicine. Keep the habits that help. But if you are lying awake night after night, the answer is not a better bedtime routine — it is a doctor, and very likely CBT-I.

Keep going

More from this wing: all 8 pages · related: why we forget, the Dream Decoder, anxiety.

Frequently asked

Does sleep hygiene fix insomnia?
Not on its own. Clinical guidelines do not recommend sleep hygiene as a standalone treatment for insomnia — CBT-I is recommended as first-line.
Is blue light from screens really bad for sleep?
The effect of typical evening device light on melatonin is real but modest and smaller than commonly claimed. What you are doing on the device is usually more arousing than the light itself.
Does everyone need 8 hours of sleep?
No. Sleep need varies between people, with most adults falling in a range rather than at a magic number. Rigidly chasing a target can itself contribute to insomnia.

Sources & further reading

  1. AASM clinical practice guideline (Edinger et al., 2021, J Clin Sleep Med): multicomponent CBT-I carries the guideline’s only strong recommendation; sleep hygiene as a single-component therapy carries a conditional recommendation against. AASM guideline, 2021 ↗
  2. ACP guideline & reviews: sleep hygiene alone is not recommended as a standalone treatment for chronic insomnia — CBT-I is first-line. ACP, 2016 ↗
  3. Evening light (including screens) can suppress melatonin and delay sleep timing via the circadian system — though the magnitude varies with intensity and individual sensitivity (circadian/light literature). Light & circadian rhythm ↗
  4. Most adults need ~7–9 hours (Sleep Research Society); a rare genetic minority (DEC2/ADRB1 “natural short sleepers”) thrive on 4–6 — but most people who think they’re short sleepers are simply sleep-deprived. Short-sleeper genetics review ↗

Not medical advice. Educational content only. Always consult a qualified clinician about your own sleep, health, or medication. Last reviewed July 2026.