Sleep is a naturally recurring state of mind and body characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity and inhibition of nearly all voluntary muscles.
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Rapid Eye Movement (REM) sleep is a stage of sleep characterized by quick random movements of eyes, dreaming and bodily movement. It's when most vivid dreams occur.
Non-REM Sleep: This is the part of sleep that consists of stages 1-3. It ranges from light dozing off (stage 1) to deep restorative sleep (stage 3).