Sleep
Sleep
Sleep (/sli:p/) is a naturally recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity and inhibition of nearly all voluntary muscles during rapid eye movement (REM) sleep, and reduced interactions with surroundings.
Etymology
The word "sleep" comes from the Old English slēp which is related to the Old High German slāf, both of which mean "sleep". It is also related to the Latin somnus and the Greek hypnos, both of which mean "sleep" as well.
Definition
Sleep is a complex biological process that helps you process new information, stay healthy, and feel rested. During sleep, your brain cycles through five different stages: 1, 2, 3, 4, and rapid eye movement (REM) sleep. These stages progress cyclically from 1 through REM then begin again with stage 1.
Related Terms
- Insomnia: A sleep disorder that is characterized by difficulty falling and/or staying asleep.
- Narcolepsy: A neurological disorder that affects the control of sleep and wakefulness.
- Sleep Apnea: A serious sleep disorder that occurs when a person's breathing is interrupted during sleep.
- REM Sleep: A stage of sleep characterized by rapid eye movements, more dreaming and bodily movement, and faster pulse and breathing.
- Non-REM Sleep: The period of sleep during which the body repairs and regrows tissues, builds bone and muscle, and strengthens the immune system.
See Also
External links
- Medical encyclopedia article on Sleep
- Wikipedia's article - Sleep
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