"Getting up in the morning and going to bed at night is not just a pure reaction to sunset and sunrise,' explains Professor Till Roenneberg, who headed up the team of researchers at Ludwig-Maximilians University in Munich. 'It's also down to your genes, which can determine how much of a night owl or early bird you are.'
The distribution of owls and larks across the population is huge, he says, with a spread of more than 12 hours between people's natural rhythms. This means that if left to their own devices, the first lark would bounce out of bed well before the last owl nods off. This, of course, doesn't fit comfortably with most work routines, with the inevitable result that a lot of people wind up feeling fatigued."
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