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BODY FUNCTIONS

CHAPTER 1 MENTAL FUNCTIONS global mental functions b134 Sleep functions General mental functions of periodic, reversible and selective physical and mental disengagement from one's immediate environment accompanied by characteristic physiological changes. Inclusion functions of amount of sleeping, and onset, maintenance and quality of sleep; functions involving the sleep cycle, such as in insomnia, hypersomnia and narcolepsy exclusion consciousness functions (b110); energy and drive functions (b130); attention functions (b140); psychomotor functions (b147)

b1340	b1341	b1342	b1343	b1344	b1348	b1349
Amount of sleep	Onset of sleep	Maintenance of sleep	Quality of sleep	Functions involving the sleep cycle	Sleep functions, other specified	Sleep functions, unspecified
Mental functions involved in the time spent in the state of sleep in the diurnal cycle or circadian rhythm.	Mental functions that produce the transition between wakefulness and sleep.	Mental functions that sustain the state of being asleep.	Mental functions that produce the natural sleep leading to optimal physical and mental rest and relaxation.	Mental functions that produce rapid eye movement (REM) sleep (associated with dreaming) and non-rapid eye movement sleep (NREM) (characterized by the traditional concept of sleep as a time of decreased physiological and psychological activity).

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