Article: Are you sleep-deprived?

SLEEP is one of the most popular research topics in psychology, yet there are still few definitive answers about this mysterious daily period of inactivity.

Professor Chris Idzikowski, chairman of the Royal Society Of Medicine's Forum On Sleep and director of the Sleep Assessment And Advisory Service, says: "I Still don't think we really know why we need sleep."

There are two theories. First, we sleep in order to conserve energy, because even though our brain activity remains high during sleep, our physical activity is kept at a minimum.

Body temperature is lowered by one to two degrees celsius when we

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