4-5% Light sleep. Muscle activity slows down. Occasional muscle twitching., 45-55% Breathing pattern and heart rate slows. Slight decrease in body temperature., 4-6% Deep sleep begins. Brain begins to generate slow delta waves., 12-15% Very deep sleep. Rhythmic breathing. Limited muscle activity. Brain produces delta waves., 20-25% REM. Brainwaves speed up. Dreaming occurs. Muscles relax. Heart rate increases. Rapid, shallow breathing..

Sleep Stages

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