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Asked by to Anna, Elaine, Fiona, Kevin, Darren on 16 Jun 2014. This question was also asked by .
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Anna Bramwell-Dicks answered on 16 Jun 2014:
Sleep gives our bodies and brains a chance to recover from one day, so that we are ready to face the next one!
Have you ever not had enough sleep and been really grumpy the next day? I know that if I don’t have enough sleep I find it really hard to work hard the next day because my brain is tired, and that makes me pretty grumpy!
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Kevin O'Dell answered on 17 Jun 2014:
Because we get tired.
Like most of biology this must all be linked to evolution. Many (perhaps nearly all) of the most successful animal species alive today sleep, so from a survival point of view it must be better to be very active for some parts of the day and sleep for other periods of time, rather than be moderately active all the time. Sleep itself is really complicated, and whilst there are lots of theories nobody really knows why we dream when we sleep.
Incidentally, it’s only in the last few years that we’ve discovered that insects have a kind of sleep too. But we’ve know idea whether they dream or not.
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Elaine Cloutman-Green answered on 17 Jun 2014:
Sleep is really important – If you don’t get enough of it it can change you personality, affect you’re ability to learn and eventually if someone stopped you sleeping for a long time you would die.
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