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Abstract
r arm a near <mar, it it $aneaegor -Any) desirer gfie thy*: f author Brood i^r
A. oaf Afar SLEEP
Sleep is a state of great human and physiological interest al, baluuan beings spend one gwrter to one ibid oftbeir Gves asleep.
It can be defined as a rapidity reversible recurrent sponta~eow episodic behavioural state of.perceptual ti#ngagement from, and unresponsiveness to, the environment, usually (but riot necessarily) accompanied by motor q^luescence. It is not a constant state but is organized to cyclic pattern of sequential stages,t’ lit is apparent that sleep is Dot synonymous with unconsciousness. The normal sleeping sutject mayor may not respond to changes in his environment depending on the stbnulus ebengtb of such changes and the stage of ms sleep. lie is however, essentially capable of being wolsen llp(Sleep is usually (but not necessarily) accompanied bypodural recu^luba^Dcy, quiescence, closed eyes and an the otherindicators one commonly associates with sleeping. ID the unusual circumstance, other behaviors can occur during sleep. Thesebebaviorsmaymclude:sleep walking, deep tallying, tooth grinding. and other physical activities.Within steep. two separate states have been defined based ore a constellation of physiological parameters. Tbese two states-non rapid eye movement (NREM) and rapid eye movement (RElU)~ex;ist m virtually all