“Rhythm is sound in motion. It is related to the pulse, the heartbeat, the way we breathe. It rises and falls. It takes us into ourselves; it takes us out of ourselves.” —Edward Hirsh Rhythm. It is ...

So should I be trying to fix my circadian rhythm—and even if I wanted to, could I? Described as the body’s internal 24-hour biological clock, “it helps regulate many essential functions, including ...

A study in the American Academy of Neurology found people who have a weak circadian rhythm are more at risk of dementia. That ...