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and walk around. Sleepwalkers have been known to drive cars and even commit murder while unconscious.

((&) Snoring

This noise is caused when soft tissue at the back of the throat relaxes and vibrates during breathing.

//gN Teeth grinding

Clenching or grinding teeth during sleep is called “bruxism.”

It can damage teeth, so sufferers often wear mouth guards.

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//g\ Sleep talking

Some sleep talkers make just random noises, but others hołd long one-sided conversations.

Sleep eating

Sleep eaters raid the fridge while fast asleep. The only clue to their nocturnal activities the next morning is crumbs in the bed.

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WHAT’S IN A NAME?

Taking naps in the day rather than a long sleep at night is called “Da Vinci sleep" after the Italian artist and serial napper Leonardo da Vinci. Yachtswoman Ellen McArthur used this power-napping technique in her record-breaking solo circumnavigation of the globe, taking freguent ten-minute naps.

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Tali stories m Kids’ bodies release morę H growth hormone during sleep, so too many late nights can leave you short-tempered ... and short!

• When you wake up after III a good night’s sleep, you II will be around 1 in (3 cm) taller than when you went to bed. During the day, gravity compresses the disks in your spine making you shorter, but as you sleep, the disks expand again.

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(c) 2011 Dorling Kindersley. Ali Rights Reserved.

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