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Sleep

Non-REM Sleep Cycles

Non-REM sleep cycles progress from light to deep stages roughly every 90 minutes before REM alternates in. Early cycles carry more deep sleep; later cycles favor REM.

Non-REM sleep cycles progress from light to deep stages roughly every 90 minutes before REM alternates in. Early cycles carry more deep sleep; later cycles favor REM.

Disrupted cycling—from apnea, pain, or late caffeine—reduces restorative benefit per hour in bed.

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