Τετάρτη, 14 Οκτωβρίου 2009

Why do we sleep?


A recent study may have an answer to one of the greatest unsolved mysteries in science - what is the purpose of sleep?
The work suggests it's actually about making animals function more efficiently in their environments.Jerry Seigel: 'It's animals that are needlessly active that will not survive, but animals that are most efficient and use their waking time to do vital functions, and are otherwise asleep that will survive.'

Sleep helps make best use of limited resources. In humans, when we're awake, our brain accounts for 20% of the energy we use when just sitting around. Sleeping also makes us less likely to get injured and less likely to be detected by predators.

Jon Stewart, BBC News

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