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When you sleep, your body rests and restores its energy levels. However, sleep is an active state that affects both your physical and mental well-being. A good night's sleep is often the best way to help you cope with stress, solve problems, or recover from illness.There are two types of sleep: Non-Rapid Eye Movement (NREM) and Rapid Eye Movement (REM). The first four stages of sleep are NREM, and the fifth is REM. Stage One: This stage of sleep is very light, and usually lasts for about five to ten... Full Article