Paul Saladino· MD
If you don't fall asleep within 5 minutes of your heading hitting the pillow you have a sleep issue. In 90%+ of cases this is due to a poor light environment in the 2-3 hours before bed.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
If you don't fall asleep within 5 minutes of your heading hitting the pillow you have a sleep issue. In 90%+ of cases this is due to a poor light environment in the 2-3 hours before bed.
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If you're not falling asleep within 5 minutes of putting your head on that pillow, you've got a problem with sleep.
If you have trouble falling asleep, I really think humans should fall asleep within five minutes, maybe three minutes of putting your head on that pillow.
10 minutes of bright outdoor light within the first hour of waking anchors the circadian phase and improves sleep onset that night.
Morning sunlight exposure shifts the cortisol awakening response forward, improving daytime alertness.
Long-term morning sunlight reduces age-related macular degeneration risk.
Sleep regularity predicts all-cause mortality more strongly than sleep duration.
Tracking deep sleep on a wearable accurately reflects EEG-measured slow-wave sleep.
Caffeine has a half-life long enough that consumption after 2pm measurably degrades deep sleep in slow metabolizers.