Your body cycles through light sleep, deep sleep, and REM roughly every ninety minutes. Deep sleep repairs tissue and strengthens immunity, while REM consolidates memories and processes emotions. Waking mid-cycle leaves you groggy; timing your alarm to land at the end of a cycle helps you feel refreshed. Most adults need four to six full cycles per night, which translates to about seven and a half to nine hours. Alcohol and screens before bed suppress REM, robbing you of emotional processing time. Tracking your sleep patterns for a week reveals where simple adjustments can radically improve how you feel.
Sleep
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