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

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

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

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

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

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

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