MOST PEOPLE SPEND A THIRD OF THEIR LIVES ASLEEP, BUT WHY?
is it so that the body can repair itself? ist part of a process in which our brain assimilates the information it has gathered during the day? or is sleep a mechanism that has evolved to keep us out of harmsway? no one knows for sure, though each hypothesis has its supporters.
it is easier to say what sleep than why we sleep. during sleep our blood pressure falls, the pulse rate drops, respiration slows, body temperature falls, most of our muscles relax , and in general our metabolic rate falls by about twenty per cent.The organ that shows the clearest distinction between the state of sleeping and waking, however is the brain. but while the activity of the sleeping brain differs from that of the waking brain it does not " switch off " during sleep.
sleep involvesfive distinict patterns- four stages of successively deeper sleep known as non rapid - eye. movement sleep (or nrem sleep) and a fifth stage known as a rapid eye movement or rem , sleep during nrem sleep,
is it so that the body can repair itself? ist part of a process in which our brain assimilates the information it has gathered during the day? or is sleep a mechanism that has evolved to keep us out of harmsway? no one knows for sure, though each hypothesis has its supporters.
it is easier to say what sleep than why we sleep. during sleep our blood pressure falls, the pulse rate drops, respiration slows, body temperature falls, most of our muscles relax , and in general our metabolic rate falls by about twenty per cent.The organ that shows the clearest distinction between the state of sleeping and waking, however is the brain. but while the activity of the sleeping brain differs from that of the waking brain it does not " switch off " during sleep.
sleep involvesfive distinict patterns- four stages of successively deeper sleep known as non rapid - eye. movement sleep (or nrem sleep) and a fifth stage known as a rapid eye movement or rem , sleep during nrem sleep,
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