Non-rapid eye movement sleep

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Non-rapid eye movement sleep (NREM or NREM sleep), pronounced as /nɒnˈræpɪd aɪ muːvmənt sliːp/, is one of the two basic states of sleep. The term originates from the fact that, unlike REM sleep, sleepers in this state do not exhibit rapid eye movements.

Etymology

The term "Non-rapid eye movement sleep" is derived from its contrast with REM sleep. The prefix "non-" is of English origin, meaning "not". "Rapid" is derived from the Latin rapidus, meaning "swift". "Eye movement" refers to the physical act of moving the eye, which is noticeably absent in this stage of sleep.

Stages

Non-rapid eye movement sleep is divided into three stages: N1, N2, and N3. Each stage represents a different level of sleep depth, with N3 being the deepest.

  • N1 - This is the lightest stage of NREM sleep. Often referred to as somnolence or drowsy sleep.
  • N2 - This stage represents a deeper level of sleep, characterized by a slowing of the heart rate and a decrease in body temperature.
  • N3 - This is the deepest stage of sleep, also known as slow-wave sleep or delta sleep.

Function

Non-rapid eye movement sleep is associated with the restoration and recovery of the body. It is during this phase that the body repairs muscles and tissues, stimulates growth and development, boosts immune function, and builds up energy for the next day.

Related Terms

  • Sleep cycle - The progression through the various stages of NREM and REM sleep.
  • Sleep deprivation - A condition that occurs if you don't get enough sleep.
  • Insomnia - A sleep disorder that is characterized by difficulty falling and/or staying asleep.

External links

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