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June 6, 2008, 7:18 pm

Lark or owl? Is it in your genes?

Some people rise early in the morning and are fresh and alert - they are known as larks - but owls prefer a longer lie-in and stay up later at night. Are these patterns of behaviour affected by our genes?

[Telegraph.co.uk]

Patterns of behaviour, or the release of molecules in our body, that occur in daily cycles are known as circadian rhythms, and are affected by many factors.