The amount of time spent in each state and stage of sleep varies and can change over time. The last period of REM sleep may last for approximately an hour. As the cycle repeats, each period of REM sleep is longer than the prior period. The arms and legs become immobile or temporarily paralyzed.Īfter each REM state, the body cycles back to an NREM state. REM sleep is the state in which dreams are most likely to occur due to heightened brain activity. During this state, heart rate and blood pressure increase and breathing quickens. The first period of REM sleep is reached about 90 minutes after falling asleep and lasts for approximately 10 minutes. Rapid eye movement (REM) sleep gets its name from the quick movement of the eyes (behind closed eyelids) that occur during this state of sleep. Deep sleep is also when memories are consolidated and learning and emotions are processed.Īfter stage 4, cycling between stage 3 and stage 2 occurs until REM sleep is achieved. During this stage, the body strengthens the immune system, builds bone and muscle, and repairs tissues. Deep sleep is also known as slow-wave or delta sleep. If an individual does wake up, they may feel disoriented. A person in deep sleep is more difficult to wake up. During deep sleep, breathing, heart rate, and body temperature reach their lowest levels. Stage 3 is the first deep-sleep stage.This prepares the body and brain to enter deep sleep in stages 3 and 4. During this stage, breathing slows down, heart rate and body temperature decrease, and the muscles relax. Stage 2 is the second stage of light sleep.Twitching may occur as the body transitions to stage 2.
The eyes are closed, but an individual in this stage of sleep can be easily awakened. Each stage typically lasts five to 15 minutes. Non-rapid eye movement is the first state of sleep that occurs immediately after falling asleep. The mind and body cycle through these states and stages throughout the night. Within those cycles, there are 4 distinct sleep stages: Light Sleep, Deep/Slow Wave Sleep (SWS), Rapid Eye Movement (REM) Sleep and Wake. Within NREM sleep, there are four different stages. The average healthy adult will experience 3-5 sleep cycles per night. Sleep consists of two different states: rapid eye movement (REM) sleep and non-rapid eye movement (NREM) sleep.
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