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 ...
Better sleep supports your overall health, while poor sleep can harm mood, thinking, heart health, immunity, and raise obesity and diabetes risk. Improve your circadian rhythm by getting bright light ...
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