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Winding up the body clock Part 1 (Teacher: Michael)

Why the human body needs to no one really knows - but we can't without it.

Exactly how much we should have is something medical experts have debating for years.

Some we live in a sleep-deprived society and should for ten hours in every 24, while most people actually only average around six. Research carried out at Loughborough University's Research Laboratory shows that people having the recommended seven-and-a-half hours cope well and are not deprived.

Sleep expert Professor James Horne points out that even one night's leaves people noticeably less alert and with slower reflexes. This can cause insomniacs to at increased risk of involvement in road accidents.

Poor sleepers also more sick than those who well. Workaholics may like to you they can survive on four hours-a night, but they are actually weakening their immune systems and leaving themselves vulnerable to. illness and infections.

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