From the Diagnosis Dictionary

Circadian Rhythm
Body Clock, Sleep Cycle, Jet Lag

Often referred to as the body clock, circadian rhythm is a 24-hour cycle that rules all of us. This internal body clock is affected by outside sources such as sun rise and time zones. And when one's circadian rhythm is disrupted, say by jet lag, sleeping and eating patterns can run amok.

The Latest on Circadian Rhythm

Jet lag can be better managed with behavioral techniques. by John Cline, Ph.D.

How time can be your friend, if you let it. by Christine Louise Hohlbaum

Disrupt your sleep, disrupt your body and brain. by Kelly McGonigal, Ph.D.

Jet lag is a problem for business and vacation travelers. by John Cline, Ph.D.

Which is better: coffee, 20 min. nap, or more sleep? by Michael J. Breus, Ph.D.

Does Marijuana affect REM sleep? by Jann Gumbiner, Ph.D.

How Geography Effects Personality by Stephen Mason, Ph.D.

Circadian Rhythm Blogs

Sleepless in America
Healthy rest, problem sleep, and the dreams and nightmares therein.
By John Cline
The Science of Willpower
Secrets for self-control without suffering.
By Kelly McGonigal, Ph.D.
Insomniac
How to become sleep savvy.
By Gayle Greene PhD