"The optimal sleep amount is a range between seven to nine hours for the average adult of any age, however, some will need a little less and many will need a little more," she said. But ...

Many US adults have suboptimal 5-year sleep duration trajectories, with these trajectories associated with an increased risk for all-cause mortality.

Less than two years after first appearing on a Billboard chart, Sleep Theory hits No. 1 on a ranking for the first time, jumping three spots to the top of the Mainstream Rock Airplay list dated ...