Are you a morning person or a night owl? The answer may be written in your DNA. A study of nearly 90,000 people who had their genomes sequenced by the consumer genetics company 23andMe has identified 15 versions of genes that are linked to reports of being an early or a late riser.
The findings, which were published in the journal Nature Communications, could improve our understanding of how our bodily clocks work - both in healthy people and in those of us with sleep disorders.
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