circadian clock

The good news: You will get a glorious extra hour of sleep. The bad: It'll be dark as a pocket by late afternoon for the next few months in the U.S.

A new study finds that preschool-age children who didn't have a set sleep routine were more likely to be overweight by the time they hit the preteen years.

Jet lag and shift work impose painful changes on the body's circadian rhythms. Adjusting oxygen consumption might help, researchers say. But don't hold your breath; it's only been tested in mice.