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In the last few days I have been tense. Jumpy. Snappy. Loath to go to bed; loath to bounce out of it. But the crisis is past. Today I feel far less like strung-out elastic.
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Experiments suggest modern norms might be at odds with human biology
Wondering how to deal with sleep deprivation when nothing else is working? Lifelong insomniac Susan Griffin shares her life-changing advice
Lunar cycles influence human beings more than you might imagine. We tell you about their effects on your health.
BBC Bitesize takes a look at the evolution of sleeping from across the centuries.