Timing and light
Wake up at the same time every day
The single change your body clock responds to more than any other — and the one most people break every weekend.
Sleep
Sleep is the first place to look when your energy is gone, and it is the area where the evidence is strongest and the changes are quickest to feel. Start with the timing of your day, not with gadgets.
Timing and light
Timing and light
Ten minutes of daylight in the morning
The cheapest way to make your body clock predictable, which is what most uneven sleep is actually about.
Timing and light
Waking up at 3am for no reason
The most common cause isn't stress in the moment — it's a stress response left over from earlier in the evening or the day.
Timing and light
Naps, done in a way that doesn't wreck the night
A short nap at the right time is close to free. A long one or a late one quietly borrows from the sleep you need that night.
Timing and light
Screens before bed — it's the brightness, not just the blue
Blue light blocking glasses barely move the needle in real trials. Dimming everything in the hour before bed does more.
Timing and light
A jet lag protocol that actually uses how light works
Left alone, your body clock shifts about an hour a day. Timed light exposure — in the right direction — can roughly double that.
Timing and light
Shift work sleep — what actually helps, honestly
Full circadian adaptation to night shifts is genuinely hard and often incomplete. A handful of strategies help meaningfully, even without fully fixing the underlying problem.
Stimulants
Stimulants
Move your caffeine cut-off to 2pm
Half of an afternoon coffee is still in you at bedtime, and it costs you sleep even on nights you fall asleep fine.
Stimulants
What alcohol actually does to your sleep
It can make you fall asleep faster and still leave you with a worse night — here is the mechanism and where the real trade-off sits.
Stimulants
Eating late isn't really the problem — what you eat late is
The link between a late dinner and bad sleep mostly runs through what's on the plate, not the clock.
Winding down
Winding down
Ten slow minutes on the floor before bed
A short, boring sequence that lowers arousal before sleep — for the nights when your body is tired but your head is not.
Supplements
Supplements
Magnesium for sleep, honestly
Widely recommended, weakly evidenced. Here is what the research actually supports and what it does not.
Supplements
Melatonin, what it is actually for
It is a timing signal, not a sedative — which is exactly why it works well for jet lag and poorly for most ordinary insomnia.
Environment
Environment
Cool the room down
Your core temperature has to drop for sleep to start — a warm bedroom fights that directly, and it is one of the cheapest fixes on this site.
Environment
White noise helps with one specific problem, not sleep in general
It works by masking disruptive noise, which means how useful it is depends entirely on how noisy your environment already is.
Exercise and sleep
Exercise and sleep
Evening workouts don't ruin your sleep — with one real caveat
Old sleep hygiene advice said never train at night. A dataset of 4 million nights says that's mostly wrong, except in one specific window.
Tracking and tools
Tracking and tools
What your sleep tracker can and can't actually tell you
Trackers are decent at telling you when you're asleep versus awake. They're much less reliable at telling you what kind of sleep you got — and treating the score as gospel has its own downside.
When to see a doctor
When to see a doctor
Snoring that's just snoring, and snoring that isn't
Roughly a third to half of adults snore regularly, and most of it is harmless. A specific set of signs separates ordinary snoring from something worth a doctor's attention.