Whether you’re an early bird or a night owl, everyone needs sleep. But, do we adults really need 7 hours of sleep a day? Why do some people get away with less and others need more? We find out more about why sleep matters for our cognitive health, together with neurogeneticist Dr Azlina Ahmad Annuar, and Prof Dr Michael Chee, Director of the Centre for Sleep and Cognition at the Yong Loo Lin School of Medicine, National University of Singapore.

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