Morning people aren't inherently better than night owls, even though society makes it seem that way. We asked a sleep expert ...

An early chronotype equates to an "early bird," while a late chronotype informally categorizes one as a "night owl". Genetic ...

Between 60 and 73 percent of the species recorded in more than one project showed signs of at least two types of daily rhythms: some mixture of daytime, night, and twilight activity. Geography of ...

A good night’s sleep is critical for our physical and mental health. And while getting the right amount of shut eye is important, the time of day you prefer to ...