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A serene figure sleeping with a glowing brain overlay, representing deep biochemistry interactions during REM sleep, pastel colors sleep circle with sleep stage to analysis of brain activity during sleep Sleep stages: lightest, light, deep sleep, REM. A nice young woman sleeps and dreams. A healthy, proper dream. Flat cartoon colorful illustration - eps10 vector. Young Man Sleeping With Hand Covering His Face Cycles of sleep sleep cycle Man sleeping peacefully, dreaming with colorful brain activity visualized in the background rem icon A sheep is sleeping in the middle of a sleep cycle.A sheep is sleeping in the middle of a sleep cycle. The cycle is divided into four phases: light sleep, deep sleep, REM sleep, and light sleep Close up shot of a dreaming dog. Dog's eyes flickr in rem phase of sleep. Static close up shot. An educational image depicting the sleep cycle with a focus on REM sleep Modern Electric Train on Elevated Railway in Montreal, Quebec, Canada