Sleeping against the clock

Sometimes the problem isn't noise or light — it's when you're trying to sleep. Jet lag, night shifts, naps that wreck the night: these guides cover how the body clock actually works and the levers (mostly light timing) that move it.

Blackout and private audio make daytime and out-of-timezone sleep survivable; that's the mask's job here. See the mask.

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How to nap without wrecking your night
Twenty minutes or ninety. The times in between are where the groggy feeling comes from.
How to beat jet lag: it's about light, not sleep
Going east is harder than west, and the lever is light timing rather than catching up on sleep.
How to sleep during the day on shift work
The daylight is the problem, and it's the part you can actually control. Anchor sleep, and the commute home.
Why the clock change leaves you exhausted
One hour is real circadian misalignment. Why spring forward hits harder, and the reset plan for either direction.
Sleep hygiene: which habits actually matter
Most lists give you twenty rules of equal weight. Three of them carry it, and one is overrated.