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alertness need

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  • Sleep — Waking up redirects here. For other uses, see Waking Up (disambiguation). This article is about sleep in general; for specifically non human sleep see Sleep (non human); for other uses, see Sleep (disambiguation). Sleeping child Sleep is a… …   Wikipedia

  • Modafinil — Systematic (IUPAC) name (±) 2 (benzhydrylsulfinyl)acetamide …   Wikipedia

  • animal communication — Transmission of information from one animal to another by means of sound, visible sign or behaviour, taste or odour, electrical impulse, touch, or a combination of these. Most animal communication uses sound (e.g., birds calling, crickets… …   Universalium

  • Yawn — Yawning redirects here. For the fish species, see Yawning (fish). Joseph Ducreux pandiculating; self portrait ca. 1783 A yawn is a reflex of simultaneous inhalation of air and stretching of the eardrums, followed by exhalation of breath. P …   Wikipedia

  • sleep — sleepful, adj. sleeplike, adj. /sleep/, v., slept, sleeping, n. v.i. 1. to take the rest afforded by a suspension of voluntary bodily functions and the natural suspension, complete or partial, of consciousness; cease being awake. 2. Bot. to… …   Universalium

  • English literature — Introduction       the body of written works produced in the English language by inhabitants of the British Isles (including Ireland) from the 7th century to the present day. The major literatures written in English outside the British Isles are… …   Universalium

  • Sleep deprivation — Classification and external resources eMedicine topic list …   Wikipedia

  • Light pollution — This article is about light pollution in the visible spectrum. For information on pollution in the radio spectrum, see radio spectrum pollution. This time exposure photo of New York City at night shows skyglow, one form of light pollution …   Wikipedia

  • pregnancy — /preg neuhn see/, n., pl. pregnancies. the state, condition, or quality of being pregnant. [1520 30; PREGN(ANT) + ANCY] * * * Process of human gestation that takes place in the female s body as a fetus develops, from fertilization to birth (see… …   Universalium

  • attention — attentional, adj. n. /euh ten sheuhn/; interj. /euh ten shun /, n. 1. the act or faculty of attending, esp. by directing the mind to an object. 2. Psychol. a. a concentration of the mind on a single object or thought, esp. one preferentially… …   Universalium

  • death — /deth/, n. 1. the act of dying; the end of life; the total and permanent cessation of all the vital functions of an organism. Cf. brain death. 2. an instance of this: a death in the family; letters published after his death. 3. the state of being …   Universalium

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