5.6 Purpose of Sleep

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7 Terms

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Sleep is

the deepest, most relaxed state of consciousness

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there are large differences in sleep depending on age such as

we sleep less as we age, REM sleep duration decreases in early childhood, we get less deep-stage sleep the older we get

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this variation is due to

genetic difference, levels of stress, social relationships and employment

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the restoration model of sleep suggests

that sleep allows s to recharge and recover from physical and mental fatigue, this means activities that increases wear on the body will lead to increase sleep movements

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levels of cellular waste (adenosine) produced during

metabolic activity, decrease during sleep, suggesting that sleep supports cellular restoration

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the evolutionary model of sleep suggests that sleep

increases a species chance of survival in relation to the environmental demands, sleep allows a species to conserve energy and be minimally active during periods of the day/night when they are most vulnerable, this is supported by observations of sleep for large prey which sleep in exposed environments

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metabolic rates drop

around 10 to 20 percent during sleeping hours compared to waking rest