It is the common answer that many a midlifer answers to the innocuous question, how are you? Exhausted. Wiped out. Bone tired. There’s even an acronym for it (presumably for those so tired they can’t get their words out): tatt — tired all the time.

One in five of us reports feeling unusually fatigued, according to the Royal College of Psychiatrists, with one in 10 suffering from prolonged tiredness. GPs report that a fifth of all patient appointments are about tiredness.

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