Question

Sleep cycle

31 Jan 2026
Answer :
Word Count : 263
Sleep cycle is a recurring pattern of physiological and neurological changes that occur during sleep, consisting of two main types: Non-Rapid Eye Movement (NREM) sleep and Rapid Eye Movement (REM) sleep. NREM sleep is further divided into three stages: N1, N2, and N3. N1 is the lightest stage of sleep, lasting a few minutes, where muscle activity slows, and the person can be easily awakened. N2 represents deeper sleep, characterized by slower brain waves, occasional sleep spindles, and K-complexes, and accounts for the largest portion of total sleep time. N3, also called slow-wave or deep sleep, is marked by delta waves, reduced heart rate and
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