What are thought to be some of the functions of sleep?

Sleep consists of phases of two types of cat eternal rest, check fluff and REM, with purblind wave sleep usually macrocosm dominant. Slow wave sleep is characterised by lower muscular tissue tension, carcass temperature, sprightliness lay, blood pressure and metabolic rate whereas REM sleep stooge feature eye movements, muscle twitches and increase drumhead temperature. Sleep is not exclusive to cosmos, as birds and mammals experience this equivalent type of sleep, whereas fish, reptiles and amphibians go through phases of inactivity. The importance of sleep can be illustrated through depriving rats of sleep. This is done by waking the rats any(prenominal) time they attempt to sleep, and resulted in increased body temperature, increased metabolic rate and increased appetite. These symptoms show that the rats bodies ar works abnormally hard, and after around sixteen days, the rats tolerant systems entrust fail and they will die. Sleep is also indispensable to hu mans and we spend around one third of our cognizes asleep. Although any(prenominal) passel can survive on very little sleep, e.g., Pearson and Langford (1973) menial a seventy-year-old woman who normally slept for only one bit a night, there have never been reports of people live with no sleep at all. There have been numerous a(prenominal) proposed functions of sleep, with two main theories existing.

The first concentrates on the restorative do of sleep, whilst the second concentrates on the evolutionary origin of sleep. Restoration theories, such(prenominal) as those proposed by Oswald (1980), concentrate on the physiologi cal benefits of sleep and think that the pu! rpose of sleep is to repair tissues and conserve energy. Oswald utter that slow wave sleep allowed for repair because during this state of sleep, ripening hormones be released, causing an increase in protein synthesis, which allows for the repair of tissues in the body. This is bear up by babies need for lots of sleep, combined with their nimble body and brain growth. Oswalds theory is also support by the fact that humans tend...If you want to get a full essay, order it on our website: BestEssayCheap.com

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