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How sleep works, in plain language.
Sleep phases, deep sleep, napping, the body clock and more — every "how does sleep work?" question we have answered, as the question you are actually asking.
Sleep science
9Wearables
1Foundation
1See how your own sleep works. SleepTrace records your night and maps your real sleep stages — so you can see your deep sleep, REM and wake-ups instead of reading about averages. Download on the App Store →