Not a morning person? Don't feel lazy - it could be down to your genes.
Scientists says that it's pointless to fight the impulse if you're a night owl or early bird because our biological clocks are pre-programmed.
A new study suggests that all plants and animals have a natural preference for day or night.
Previous studies had spotted genes that have some form of influence on the body's circadian rhythm.
However, little was known about which parts of our genetic code were involved.
A research team working for biotechnology company 23andMe looked through the genomes of nearly 90,000 people for clues.
The team compared the genomes to a web survey in which the same people were asked to say whether they preferred mornings or evenings.
The team was led by David Hinds and the results were published in the Nature Communications journal.
A link was discovered between more than dozen gene variants and healthy individuals who said they felt best in the morning.
The study also found that those who rise early were less likely to have insomnia or need more than eight hours of sleep each night.
They were also less prone to depression than those who identified as night owls.
Circadian rhythms are controlled by a mechanism in the neurons in a part of the brain in the hypothalamus.
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