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By the time we reach the age of 75, we have spent an average of one third of our lives sleeping. And the quality of the remaining two thirds depends a lot on these nights. Sleep therefore demands respect and can be repaired when it is mistreated. A golden rule: listen to your internal clock. The question remains how to do it and what type of sleeper we are. HOSTED BY: Dr Sophie Lemonier GUEST: Dr Joëlle Adrien, neurobiologist