When we’re busy or on a deadline, sleep can fall by the wayside. But sleep is about much more than just putting our brains on standby – research has shown that it helps us process memories, synthesise hormones, grow muscle and repair tissue. Reduced sleep can make us panda-eyed, more irritable and less productive, not to mention prone to knocking over everything in the kitchen. Coffee might prop you up for the afternoon, but the best way to feel better is to get a good night's kip.

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