Circadian biology, sleep architecture, tracker accuracy and the supplements with trial evidence, magnesium and glycine among them.
Short sleep is one of the few hormone disruptors tested in tightly controlled human experiments. What a run of five-hour nights did to testosterone, insulin and appetite, and what reversed it.
Trials that timed naps by the minute found 10 minutes restored alertness at once, 20 took half an hour to pay off, and 30 began with grogginess. The evidence on length, timing and coffee naps.
Caffeine outlasts the buzz. What trials found when it was taken 0, 3, 6 and even 16 hours before bed, and how dose and half-life turn those results into a personal cutoff.
The gut runs on its own circadian clock. Late or irregular meals disturb enzyme timing and overnight motility, which can produce bloating that diet changes alone do not fix.
Apigenin is chamomile's main flavonoid. It inhibits the NAD+-consuming enzyme CD38 in mice and acts on GABA-A receptors in cell studies; human evidence comes from chamomile trials, and the testosterone claim has none.
Magnesium L-threonate was designed to raise brain magnesium. The human evidence is one 12-week cognition trial and a short sleep study, both worth reading with care. What they found and what remains unproven.
A consistent schedule, a cool dark room, no late caffeine or alcohol, and morning light are the sleep habits with the best evidence. What each one does, and when to see a clinician.
Magnesium is one of the most popular sleep supplements. The evidence is modest and mixed. Here is what it can realistically do, and which forms to choose.
Your wearable confidently reports last night's deep sleep down to the minute, but the gap between that number and laboratory polysomnography is wider than the app lets on — here is how to read your data honestly.
Falling asleep depends on your body shedding heat, and a cool room is one of the few sleep interventions with consistent, mechanistically clear support — here is how to dial it in.
Evening blue light delays melatonin, but room brightness and timing matter more than any single screen. Why morning light and dim evenings beat screen filters.
Trials find 0.3–1 mg of melatonin works about as well as 5–10 mg tablets for falling asleep, and timing matters more than dose. How it is used for jet lag and phase shifts, and cautions.
Glycine is a cheap, simple amino acid with a small but genuinely interesting body of research suggesting it can help you fall asleep faster and feel sharper the next day — by cooling you down from the inside.
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