Sleep
Sleep is a naturally recurring state of mind and body, characterized by altered consciousness, reduced sensory activity, and inhibition of nearly all voluntary muscles. It is essential for physical and mental health, supporting processes such as memory consolidation, immune function, and cellular repair. Sleep occurs in cycles, alternating between non-rapid eye movement (NREM) and rapid eye movement (REM) stages. Most adults require 7–9 hours of sleep per night, though needs vary by age and individual. Sleep disorders, such as insomnia and sleep apnea, can significantly impact well-being.
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ENGLISH COLLECTIONSEPTEMBER 4, 2025 AT 08:25:26 UTC