Sleepiness; drowsiness; inclination to sleep.

Difficulty maintaining alert wakefulness so that a person falls asleep if not actively kept aroused.

Feeling extremely tired, drowsy and irritable. Can be a side effect of a long course of radiotherapy to the brain. May last for some weeks after treatment has finished.

a very sleepy state; "sleepiness causes many driving accidents"

An inclination to sleep

also called excessive sleepiness or excessive daytime sleepiness; the inability to stay awake during the normal wake period of a sleep-wake cycle. It can be measured by a multiple sleep latency test (MSLT)

causing drowsiness.

Prolonged drowsiness or sleepiness. Close Window

Feelings of sleepiness.

Excessive sleepiness or unnatural drowsiness. For people with COPD, it is a sign of dangerously high levels of carbon dioxide in the blood. If you experience this you should seek emergency care immediately.

Excessive drowsiness or sleepiness.

Sleepiness, abnormal drowsiness

A feeling of sleepiness or tiredness.

somnolency sawm'nolence, sawm'nolency; 1. Drowsiness; sleepiness 2. A condition of semiconsciousness approaching coma. Term: Definition

Oppressive drowsiness or inclination to sleep.

Somnolence (or "drowsiness") is a state of near-sleep, a strong desire for sleep, or sleeping unusually long periods. 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.