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Drowsiness

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Drowsiness

Somnolence
Classification and external resources
ICD-10 9 MedlinePlus 003208

Somnolence (or "drowsiness") is a state of near-sleep, a strong desire for sleep, or sleeping for unusually long periods (cf. hypersomnia). It has two distinct meanings, referring both to the usual state preceding falling asleep,[1] and the chronic condition referring to being in that state independent of a circadian rhythm. "Somnolence" is derived from the Latin "somnus" meaning "sleep."

Hazards

Sleepiness can be dangerous when performing tasks that require constant concentration, such as driving a vehicle. When a person is sufficiently fatigued, microsleeps may be experienced.

Illness

The human body can become sleepy in response to infection.[2] Such somnolence is one of several sickness behaviors or reactions to infection that some theorize evolved due to promoting recovery by conserving energy while the body fights the infection using fever and other means.[3][4]

Associated conditions

See also

References

fr:Sommeil#Somnolence
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