Sleep Hygiene: What Actually Works (and What Doesn't)

Sleep Hygiene: What Actually Works (and What Doesn't)

2026-05-25 · 5 min read

Sleep deprivation is linked to obesity, diabetes, cardiovascular disease, depression, and reduced immune function. It also makes every other healthy habit harder to maintain. Fixing sleep is often the highest-leverage health intervention available.

The Highest-Impact Changes

  1. Consistent wake time — same time 7 days a week, even weekends (this is #1)
  2. Cool, dark bedroom — 65–68°F / 18–20°C is optimal
  3. No alcohol within 3 hours of bed — it fragments sleep architecture profoundly
  4. Morning sunlight within 60 minutes of waking (sets melatonin timer)
  5. No screens for 60 minutes before bed, or use true night mode settings

What Doesn't Work As Well As Advertised

  • Melatonin supplements — low dose (0.5mg) helps with timing, but won't make you sleep longer
  • Counting sheep or forcing relaxation — increases arousal through effort
  • Sleeping in on weekends — creates 'social jet lag' that disrupts the following week
  • White noise machines — helpful for some, irrelevant for most

If You Can't Fall Asleep

Get out of bed after 20 minutes of lying awake. Do something calm in dim light (reading physical book, light stretching) until you feel sleepy, then return. Staying in bed while anxious trains your brain to associate bed with wakefulness.

Caffeine Has a Long Half-Life

Caffeine has a 5–6 hour half-life. Coffee at 3pm still has half its caffeine in your system at 8pm. Try cutting off caffeine by 1pm for two weeks and notice the difference in sleep quality.

The Wind-Down Window

Your body temperature needs to drop to initiate sleep. A warm shower 90 minutes before bed paradoxically helps — the subsequent heat dissipation drops core temp faster. This signals sleep readiness more effectively than most supplements.

Fix your wake time first. Everything else follows. When you wake at the same time daily, sleep pressure builds naturally and bedtime falls into place.

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