These waves have a frequency of 0.5 to 2 Hertz and they must make up at least 6 seconds of a 30-second window for that window to count as deep sleep. During deep sleep, electrical activity in the brain appears in long, slow waves called delta waves. Experts believe most of our dreaming happens during REM sleep.ĭeep sleep, also called slow-wave sleep, occurs in the third stage of non-rapid eye movement (NREM) sleep. However, you lack muscle tone and do not move. Your brain activity is similar to that of a person who is awake. REM: As the name suggests, your eyes move quickly beneath your eyelids during REM sleep.Stage 3: Previously divided into stages 3 and 4, stage 3 slow-wave sleep represents the deepest sleep of the sleep cycle, when brain waves are at their slowest in frequency and highest in amplitude.About half of your total sleep every night is spent in this stage Stage 2 sleep lasts longer in each cycle throughout the night. Your temperature drops and your muscles relax. Stage 2: In this stage of light sleep your breathing and heart rate slow even more.
Stage 1: This brief, drowsy stage marks the transition to sleep, when your breathing and heartbeat slow down.However, as the night goes on, you spend more and more time in REM sleep. In the first half of the night you spend more time in NREM sleep. Adults typically have 4-6 such cycles per night. It usually takes between 90 and 120 minutes to cycle through all four stages, after which the cycle starts again. Once you fall asleep, your body cycles through three non rapid eye movement (NREM) phases of sleep followed by one rapid eye movement (REM) sleep stage. Deep sleep is the repairing and restorative sleep that is necessary to feel your best each day.īecause of the potential impacts of obtaining insufficient deep sleep, it is important to understand what deep sleep is, the benefits of deep sleep, and the signs of insufficient deep sleep. There are four sleep stages, and each stage has a specific purpose. Like eating and exercising, sleep is crucial for your health.
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