Deep sleep
Deep Sleep
Deep sleep (pronounced: /di:p sli:p/), also known as Slow-wave sleep or Delta sleep, is a stage of sleep that is characterized by the slowest brain waves during sleep.
Etymology
The term "deep sleep" is derived from the fact that it is harder to wake up from this stage of sleep. The term "slow-wave sleep" comes from the slow brain waves that are observed during this stage of sleep.
Definition
Deep sleep is the third stage of non-REM sleep, which is itself the first phase of the sleep cycle. During deep sleep, the brain waves are slow and the brain activity is at its lowest, which is why it is the most restorative sleep stage.
Related Terms
- Sleep cycle: The progression through the stages of non-REM sleep to REM sleep before beginning the progression again with non-REM sleep.
- Non-REM sleep: The period of sleep that includes three stages of sleep, each deeper than the last.
- REM sleep: The period of sleep that involves rapid eye movements and dreaming.
- 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.
See Also
External links
- Medical encyclopedia article on Deep sleep
- Wikipedia's article - Deep sleep
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