Simply put, your circadian rhythm is your body's internal clock. Operating on a roughly 24-hour cycle, it governs our sleep-wake cycle and plays a large part in everything from hormone release to body temperature.

Disrupting the body's circadian rhythms may be even worse than previously believed.

Nauseated, exhausted, disoriented, confused: Not the vibe of a glamorous jet-setter. Jet lag can be a serious downer in the first few days of your big international trip. Solution: Try these diet and exercise tips to reduce the severity and duration of your symptoms.