Most adults need 7 to 9 hours of sleep, but sleep needs vary by age and can differ based on genetics and sleep quality. Quality sleep helps your body rebuild muscle, clear brain toxins, support your ...
Sleep happens in cycles that include three non-rapid eye movement (NREM) stages and one rapid eye movement (REM) stage, repeated 4 to 5 times nightly. Each cycle typically lasts 90 to 110 minutes. The ...
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