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Cycles of sleep sleep circle with sleep stage to analysis of brain activity during sleep sleep cycle Woman in a face mask reading a book in ber rapid eye movement Sleep stages: lightest, light, deep sleep, REM. A nice young woman sleeps and dreams. A healthy, proper dream. Flat cartoon colorful illustration - eps10 vector. A serene figure sleeping with a glowing brain overlay, representing deep biochemistry interactions during REM sleep, pastel colors Sleep cycle infographics. Stage of sleep during rem  icon Young woman sleeping with glowing digital brain visualization for dream research, neuroscience studies, and sleep technology concepts in cognitive science and artificial intelligence applications Man Sleeping on a Bed in Morning Light | Peaceful Rest and Early Day Serenity Modern Electric Train on Elevated Railway in Montreal, Quebec, Canada