Researchers find 351 genetic variants associated with a person's chronotype. Before this study, we knew of only 24.
Our study found that the performance of “night owls” and “morning larks” varied considerably on both cognitive and physical tasks.
The old saying 'the early bird catches the worm' might be especially fitting when it comes to peak mental and physical performance.
Changing to daylight saving time can impact our mood, our risk of heart attack and how much exercise we get.
Daylight saving time begins this weekend, which means many of us will get an hour less sleep. But the health effects go beyond sleep – and can last two weeks or more. Here's what the research says.
Could too much light in the evening affect children’s sleep? Recent research suggests that it could.
A recent study suggested that a chemical responsible for getting the body ready for sleep was suppressed in children by too much evening light. A circadian rhythm expert explains the dangers.
Night owls, or people who have a hard time waking up in the morning, face health risks as a result.
Pity the poor night owls of the world, who already must adjust to a life that doesn't align with their natural sleep patterns. Now it appears that being a night owl even raises the risk of death.
A New York engineer is wheeled away in December 2013, after a train he was driving crashed. Lack of sleep could have been a factor.
AP Photo/Robert Stolarik
Most Americans dread the time switch to daylight saving time, which results in a loss of an hour's sleep. The downside is more serious than that – it can lead to workplace injuries and traffic fatalities.