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Published online 30 December 2004 | Nature | doi:10.1038/news041229-5
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Early sleep marks the end of adolescence
'Lazy' teenagers undergo change in sleep patterns at age 20.
We all know that teenagers hate to get up in the morning. But are they really just lazy, or is there a biological cause?
A European survey of the sleeping habits of 25,000 people now provides powerful evidence that biology is indeed to blame.
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