Rapid eye movement, or REM sleep, is the fourth stage of sleep. During this stage, your muscles are fully relaxed and your heart rate and breathing are at their slowest of the night. Stage 3: Also called slow-wave sleep, the third stage of NREM sleep is deep sleep that is important for feeling well-rested in the morning.As your body moves towards sleeping more deeply, your muscles continue to relax and your heart rate and breathing continue to slow down. Stage 2: The second stage of NREM sleep is another stage of light sleep.As you fall asleep, your muscles begin to relax and your heart rate and breathing slow down. Stage 1: The first stage of NREM sleep is a period of very light sleep that begins as you doze off and transition into sleep.Each stage is associated with certain changes in the body. During each cycle of NREM sleep, your body transitions through three sleep stages. Up to 80% of the time you spend asleep is in non-rapid eye movement sleep. The patterns in how you progress through these sleep cycles are affected by a variety of factors, including age, sex, and recent sleep habits. Your body cycles through all of the stages of sleep four to six times each night, going through one about once every 90 to 120 minutes. Each stage is associated with a different depth of sleep as well as specific patterns in brain waves and muscle activity in the body. The first three stages are called non-rapid eye movement (NREM) sleep and the final stage is called rapid eye movement (REM) sleep. During a night of sleep, your body cycles through four stages of sleep.
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