Article: THE A TO Z OF SLEEP ; The secrets of shut-eye ++ We all know the benefit of a good night's rest. Now a study shows an afternoon nap can cut heart deaths. Jeremy Laurance wakes up to the weird and wonderful world of slumber

A IS FOR SLEEP APNOEA, a common disorder, often signalled by snoring, which leaves sufferers feeling weary even after a full night's sleep. Tissue at the back of the throat collapses and blocks the airway causing the sleeper to struggle for breath until jerking suddenly awake. In the worst affected, this may happen hundreds of times a night though they have no memory of waking. Treatment is with a contraption that blows air directly into the nose to keep the airway open.

B IS FOR BABIES which should always be laid to sleep on their backs. This is the surest way to protect against cot death. A baby laid to sleep on its front is more likely to suffocate or become overheated. On its back with ...

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