Sleep onset
Sleep onset
Sleep onset (pronunciation: /sliːp ˈɒnsɛt/) refers to the transition from wakefulness into sleep. It is the period during which an individual moves from full wakefulness to the first stage of sleep, known as Non-Rapid Eye Movement (NREM) sleep.
Etymology
The term "sleep onset" is derived from the English words "sleep", which originates from the Old English word "slæpan", and "onset", which comes from the Middle English word "onseten". Both words combined describe the beginning or start of sleep.
Related Terms
- Sleep cycle: The progression through the various stages of NREM and Rapid Eye Movement (REM) sleep in a specific order. It typically lasts about 90 minutes and is repeated several times during a good night's sleep.
- Sleep latency: The length of time that it takes to accomplish the transition from full wakefulness to sleep, also known as sleep onset latency.
- Insomnia: A sleep disorder that is characterized by difficulty falling and/or staying asleep.
- Hypnagogia: The experience of the transitional state from wakefulness to sleep.
- Circadian rhythm: The 24-hour internal clock that cycles between sleepiness and alertness at regular intervals.
See Also
External links
- Medical encyclopedia article on Sleep onset
- Wikipedia's article - Sleep onset
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