why do your eyes twitch when you are tired
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We spend around a third of our lives doing it.
Eight hours is the gold standard, yet Margaret Thatcher, Florence Nightingale and Napoleon are said to have got by on four hours a night.
Sleep gives our bodies time to recover from the day, to recuperate, making it vital to our health and wellbeing.
But, while recognising its importance, many things about our time asleep remain a mystery.
From twitchy eyes when we're tired, to why we only remember some dreams - and what causes those uncontrollable jolts as we're slipping into the land of nod - here a team of experts reveal more about the wonderful world of sleep.
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