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Night-night: The hormone adenosine suppresses brain cell activity, leading to an increased feeling of drowsiness the longer a person has been awake. During sleep, the adenosine is broken down. Caffeine binds to adenosine receptors, so it can help people stay awake. Photo: Aja Koska

Put your body clock to rights

An edited extract from a new book by Dr Michael Mosley called 4 Weeks to Better Sleep

  • Eyaaz
5 min read