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Sleep Illustration and Icon
Sleep
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A stylized illustration shows a human figure asleep on a large cloud, lying in a lateral recumbent position with a pillow and closed eyes. The scene represents the physiological and behavioral state of sleep in Homo sapiens (human), examined in neuroscience and sleep medicine. Within the biological hierarchy, sleep reflects central nervous system activity within the whole organism. This state supports homeostasis, tissue recovery, and memory consolidation, and alternates between non-rapid eye movement (NREM) and rapid eye movement (REM) stages, though specific stages are not depicted.
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