Sleep: how much do we really need?

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...
Source: Guardian Unlimited Science - Category: Science Authors: Tags: Science Sleep Life and style Health & wellbeing Source Type: news