Early Bird or Night Owl? Blame Your DNA

How long you sleep may be a product of your genetics, NBC News reported Tuesday. A new study analyzed the DNA of 50,000 people in sleep studies and found that people who typically undersleep or oversleep have genetic mutations that may affect thyroid hormones. Overactive thyroids can cause sleeplessness, while overactive thyroids can cause sleepiness, although researchers said they needed to study the connection in greater detail.

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