Whether you prefer waking up in the morning or staying up all night was partly determined by your genes.

A study published in Nature Communications studied nearly 90,000 individuals (from the 23andMe cohort) and found 15 loci (locations of genes) significantly associated with morningness.

Read: Media says too much sleep will kill you

Researchers found that females and older people are more likely to be morning people.

The lucky early bird is less likely to sweat while sleeping, sleep walk, need > 8 hours per night, suffer from depression and insomnia.

However, it’s not bad news for all of the night owls. If you’re a 20 something male, the next time you’re late for that early morning meeting, try blaming it on your genes.

For more:

Is It Really Better to be a Morning Person?

Does Sleepytime Tea Actually Work?

Stop Staring Into Your Screen Before Bed. No, really. 

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