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Stage 3 in the sleep cycle is the deep sleep stage. This is the stage of sleep that puts your body in recovery mode, This is where your mind and body slow down, blood pressure is reduced, heart rate goes down, and you are completely calm and relaxed. Overall brain activity slows down in this stage. When people are speed time in this stage of this, they wake up feeling refreshed. Other ways to describe deep sleep are below: sleep like a log slept like a baby The opposite of deep sleep is light sleep. This is when you toss and turn all night and wake up tired even if you slept for over 7 hours.
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