scientific definition of sleep - EAS
Scientific definition of sleep
“Sleep is a naturally recurring state characterized by reduced or absent consciousness, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles.” A slightly more scientific definition can be found in Stedman’s Medical Dictionary:www.howsleepworks.com/what_definition.html- https://healthysleep.med.harvard.edu/healthy/science/what
After all, detailed analysis of our own sleep isn't really an option, given that we rarely know that we're sleeping when we're asleep. And even if we observe the sleep of others, so much of what they experience—changes in the functions of their brains and bodies—is not easily seen from the outside. Sleep scientists have explored these changes in depth, and their definition of sleep is …
- https://medical-dictionary.thefreedictionary.com/sleep
sleep [slēp] a period of rest for the body and mind, during which volition and consciousness are in partial or complete abeyance and the bodily functions partially suspended. Sleep has also been described as a behavioral state marked by characteristic immobile posture and diminished but readily reversible sensitivity to external stimuli. NREM and REM ...
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- https://www.ninds.nih.gov/.../Understanding-Sleep
There are two basic types of sleep: rapid eye movement (REM) sleep and non-REM sleep (which has three different stages). Each is linked to specific brain waves and neuronal activity. You cycle through all stages of non-REM and REM sleep several times during a typical night, with increasingly longer, deeper REM periods occurring toward morning.
- https://www.merriam-webster.com/dictionary/sleep
Definition of sleep. (Entry 1 of 2) 1 : the natural, easily reversible periodic state of many living things that is marked by the absence of wakefulness and by the loss of consciousness of one's surroundings, is accompanied by a typical body posture (such as lying down with the eyes closed), the occurrence of dreaming, and changes in brain activity and physiological …
- https://www.hopkinsmedicine.org/health/wellness...
Before the 1950s, most people believed sleep was a passive activity during which the body and brain were dormant. “But it turns out that sleep is a period during which the brain is engaged in a number of activities necessary to life—which are closely linked to quality of life,” says Johns Hopkins sleep expert and neurologist Mark Wu, M.D., Ph.D. Researchers like Wu are spending …
- https://www.britannica.com/science/sleep
Mar 09, 2022 · sleep, a normal, reversible, recurrent state of reduced responsiveness to external stimulation that is accompanied by complex and predictable changes in physiology. These changes include coordinated, spontaneous, and internally generated brain activity as well as fluctuations in hormone levels and relaxation of musculature.
- https://www.sleepfoundation.org/how-
Apr 01, 2022 · Sleep is a complex and dynamic biological process that still isn’t fully understood. Learn about how sleep works and why it’s vital for overall health.
Overview of sleep & sleep disorders
https://pubmed.ncbi.nlm.nih.gov/20308738Sleep is defined on the basis of behavioural and physiological criteria dividing it into two states: non rapid eye movement (NREM) sleep which is subdivided into three stages (N1, N2, N3); and rapid eye movement (REM) sleep characterized by rapid eye movements, muscle atonia and desynchronized EEG. Circadian rhythm of sleep-wakefulness is controlled by the master clock …
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