Sleep: how much do we really need?
the Guardian -

The optimum amount of sleep is supposed to be eight hours a night. Why is shuteye so important – and what happens if we don’t get enough?

“The only known function of sleep is to cure sleepiness,” the Harvard sleep scientist Dr J Allan Hobson once joked. This isn’t quite true, but the questions of why we spend about a third of our lives asleep and what goes on in our head during this time are far from being solved. Continue reading...


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