Clay_Miller
"Getting at least seven hours of sleep is good for you"
A natural periodic state of rest for the mind and body, in which the eyes usually close and consciousness is completely or partially losti.
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The purposes and mechanisms of sleep are only partially clear and are the subject of intense research.
For example, if I work a night shift I usually sleep just about four hours a day, and I feel fine for most of the day. Similarly if I go to bed normally I need about 7.
I suspect that sleep is a lot more complicated than we like to think, and that our bodies do it even when we'd rather not (there are periods of time during night shifts when just about anyone I know who has worked such shifts admits to being "half-asleep" and this might account for the reduction in necessary sleep under such conditions). Just as some birds can sleep with half their brain and one eye open, it might be that we can also partially sleep.
But the down side of this is if you don't give yourself the right amount of sleep when YOU need it, you will get it when you'd rather not. That means less alertness, only nominal consciousness (I can remember driving places after work when I worked a night shift and realizing when I got there that I had major gaps in my memory of driving). Even falling asleep at the wheel.
The secret to me is that I try to sleep such that I get up when I wake up as often as possible, rather than forcing myself awake with alarm clocks.