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What makes you tick?

How do you know when it's time to wake up or go to sleep? More powerful than any alarm are your circadian rhythms. In this animation we take a look at how these rhythms work and what controls them.

The importance of sleep

How do you know when it's time to wake up or go to sleep? More powerful than any alarm are your circadian rhythms -natural biological rhythms regulated by exposure to light. We joined Dr Chris Harvey - in bed!

Evan Davis and Russell Foster

Join sleep-deprived presenter of Radio 4′s Today's programme, Evan Davis, and Oxford researcher Professor Russell Foster on the subject of sleep. Filmed at the Cheltenham Science Festival.

Victorian and modern sleep researchers

Russell Foster and Sally Shuttleworth explore some of the key differences and similarities in the way that Victorian and modern researchers studied/study sleep.