wakeful

adj.

1. 1. Not sleeping or not able to sleep.
   2. Without sleep; sleepless.
2. Watchful; alert.

wakefully wake'ful·ly adv.
wakefulness wake'ful·ness n.

adjective

1. Not in a state of sleep: awake, unsleeping, wide-awake. See awareness/unawareness.
2. Marked by an absence of sleep: sleepless, slumberless. See awareness/unawareness.
3. Vigilantly attentive: alert, observant, open-eyed, vigilant, wary, watchful, wide-awake. Idioms: on the ball. See awareness/unawareness.

adj

Definition: alert, restless
Antonyms: sleepy, unaware

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Believed to occur when the tonic flow of impulses from the reticular activating system exceeds the critical level for sustaining consciousness; reduction of reticular activating system activity is the basis of the pharmacological induction of sedation.

Dansk (Danish)
adj. - årvågen, vågen, søvnløs

Nederlands (Dutch)
waakzaam, slapeloos

Français (French)
adj. - éveillé, vigilant

Deutsch (German)
adj. - schlaflos, wachsam

Ελληνική (Greek)
adj. - άγρυπνος

Italiano (Italian)
sveglio

Português (Portuguese)
adj. - alerta

Русский (Russian)
бодрствующий, бдительный, бессонный, страдающий бессонницей

Español (Spanish)
adj. - desvelado, alerta, insomne, despierto, vigilante

Svenska (Swedish)
adj. - sömnlös, vaksam

中文（简体）(Chinese (Simplified))
不能入睡的, 觉醒的

中文（繁體）(Chinese (Traditional))
adj. - 不能入睡的, 覺醒的

한국어 (Korean)
adj. - 잠 못 이루는, 불면의, 방심하지 않는

日本語 (Japanese)
adj. - 眠れない, 目を覚ましている, 起きている, 油断のない

العربيه (Arabic)
‏(صفه) ساهر, سهران, يقظ, منتبه‏

עברית (Hebrew)
adj. - ‮ער, לא ישן, ללא שינה‬

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