AskDefine | Define sleepiness

Dictionary Definition

sleepiness n : a very sleepy state; "sleepiness causes many driving accidents" [syn: drowsiness, somnolence] [ant: wakefulness]

User Contributed Dictionary



  1. The property of being sleepy.


property of being sleepy

Extensive Definition

Somnolence (or "drowsiness") is a state of near-sleep, a strong desire for sleep, or sleeping for unusually long periods (c.f. hypersomnia). It has two distinct meanings, referring both to the usual state preceding falling asleep, and the chronic condition referring to being in that state independent of a circadian rhythm. The disorder characterized by the latter condition is most commonly associated with users of prescription hypnotics, such as mirtazapine or zolpidem.
It is considered a lesser impairment of consciousness than stupor or coma.


Sleepiness can be dangerous when performing tasks that require constant concentration, such as driving a vehicle. When a person is sufficiently fatigued, he or she may experience microsleeps (loss of concentration).

Associated conditions

sleepiness in Bosnian: Somnolencija
sleepiness in German: Somnolenz
sleepiness in Korean: 졸림
sleepiness in Croatian: Somnolencija
sleepiness in Italian: Sonnolenza
sleepiness in Polish: Somnolencja
sleepiness in Swedish: Somnolens
sleepiness in Thai: ความง่วง

Synonyms, Antonyms and Related Words

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