Quick Take Owls are nocturnal, sleeping during the day and hunting at night. Owls typically sleep roughly 10 to 12 hours ...

The researchers discovered there were not two distinct chronotypes but five—two kinds of early birds and three kinds of night owls. One group of early birds tended to suffer from depression while ...

Early birds and night owls are the best-known ' chronotypes ' – profiles that describe when during the day a person is most ...

This archived news story is available only for your personal, non-commercial use. Information in the story may be outdated or superseded by additional information. Reading or replaying the story in ...