CNN: Morning larks, people who wake up early, tend to be happier than night owls, according to new research.

The study used sleep data gathered from wrist activity monitors worn by more than 85,000 participants of the UK Biobank Study, which houses in-depth genetic and health information on more than a half a million Brits. Researchers compared that sleep information to self-reports of mood and found that people with a misaligned sleep cycle more likely to report depression, anxiety and have fewer feelings of well-being.

“The health problems associated with being a night owl are likely a result of being a night owl living in a morning person’s world, which leads to disruption in their body’s circadian rhythms,” said sleep specialist Kristen Knutson, an associate professor of neurology and preventive medicine at Northwestern University Feinberg School of Medicine, who was not involved in the study.

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