Around one-third of people are night owls, preferring to stay up late and sleep in, while about one-quarter are early-rising larks.
The rest fall somewhere in between.
Research suggests that these different sleep patterns are linked to far more than just when we prefer to get out of bed.
Night owls and early birds differ in personality, intelligence, physical health and mental wellbeing.
Studies have even found differences in morality, brain structure and the risk of depression.
Here are some of the most intriguing psychological effects of being a night owl or a lark.
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Author: Dr Jeremy Dean
Psychologist, Jeremy Dean, PhD is the founder and author of PsyBlog. He holds a doctorate in psychology from University College London and two other advanced degrees in psychology. He has been writing about scientific research on PsyBlog since 2004. View all posts by Dr Jeremy Dean
