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Sleep basics6 min readNewest

How Sleep Works: Stages, Cycles and a Normal Night

The four sleep stages, the 90-minute cycle, the two systems that decide when you sleep, how needs change with age, and what a normal night looks like — including the wakings you forget.

Dr. Adekunle Ajisebutu, MD ·

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Sleep basics6 min read

Are Sleep Trackers Accurate?

Sleep trackers estimate sleep from movement, heart rate and oxygen. Learn what they get right, where they fall short, and when a sleep study is needed.

10 Ways to Manage Stress Before Bed

A racing mind at bedtime is common and manageable. Ten practical ways to lower arousal in the evening, what the evidence says about each, and how to tell stress from anxiety that needs care.