Sleep advice on the internet is a maze of gadgets, supplements, and miracle routines. Talk to actual sleep researchers, though, and the recommendations are almost disappointingly simple. The five changes with the strongest evidence cost nothing.
1. Fix your wake time. The single most powerful lever is waking at the same hour every day — including weekends. A consistent wake time anchors your body clock far more effectively than forcing an early bedtime, which mostly produces frustration while lying awake.
2. Get morning light. Ten to thirty minutes of outdoor light within an hour of waking does more for evening sleepiness than any supplement. Light is the signal that sets the timer for melatonin release roughly fourteen hours later.
3. Cut caffeine by early afternoon. Caffeine's half-life is five to six hours. A 4 PM coffee means a meaningful dose is still circulating at midnight, even if you feel able to fall asleep. The sleep you get on residual caffeine is measurably shallower.
4. Keep the bedroom cool and boring. Body temperature needs to drop to initiate sleep. A slightly cool room — around 18–19°C — helps more than a warm blanket cocoon. And the bed should be for sleep only; working in bed trains the brain to associate the mattress with alertness.
5. Stop chasing a perfect score. Sleep trackers are useful for spotting trends, but obsessing over nightly scores creates anxiety that itself damages sleep — a phenomenon researchers now call orthosomnia.
None of this is glamorous. That is exactly the point: sleep responds to boring consistency, not to products. If you change only one thing this week, pick the fixed wake time — the rest follows more easily than you would expect.