Sleep
Sleep Stages Cycling
Sleep stages cycling repeats light, deep, and REM sleep in ~90-minute cycles—disrupted by alcohol, fragmentation, and inconsistent schedules.
Sleep stages cycling is the repeating progression through light NREM, deep slow-wave sleep, and REM across ninety-minute cycles—four to six cycles nightly for most adults. Alcohol and benzodiazepines blunt REM; fragmentation resets cycles.
Wearables estimate stages; polysomnography confirms clinically.
Common questions
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How many sleep cycles do adults need?
Most adults need four to six ninety-minute cycles per night—roughly seven to nine hours total. Missing early cycles costs deep sleep; late short nights steal REM.
Related terms
Put Sleep Stages Cycling into practice
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