Non-REM Sleep
all stages of sleep except REM sleep
Non-REM sleep, also referred to as quiet sleep or NREM sleep, is one of the two main types of sleep that occur during the sleep cycle. Generally, non-REM sleep is characterized by slower brain wave activity, reduced muscle movement, and slowed heart rate and breathing.
There are three stages of non-REM sleep, with each stage being a deeper level of sleep than the previous one. Stage 1 is a very light sleep during which the person can be easily awakened. In stage 2, the person becomes more relaxed and the brain activity slows down. Stage 3 is the deepest level of sleep which is characterized by very slow brain waves, and the person is very hard to wake up.
During non-REM sleep, the body undergoes cellular and tissue repair, and energy is restored. This type of sleep is essential for optimal physical and mental health, including immune function and memory consolidation. People typically spend about 75% of their sleep time in non-REM sleep, with the remainder spent in REM sleep.
Factors that can influence the quality and duration of non-REM sleep include age, stress, medications, sleep disorders, and lifestyle habits such as diet and exercise. However, practicing good sleep hygiene, such as maintaining a regular sleep routine and creating a comfortable sleep environment, can help improve the quality and quantity of non-REM sleep.
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