Jet lag is the result of a rather sudden mismatch between the body’s own internal clock (circadian rhythms) and that of the environment around us. The body’s circadian rhythms usually cycle somewhere between a 24 to 25 hour time period and tell us when it is time to go to sleep and when to awaken. These rhythms are reset daily to match a 24 hour day by factors such as exposure to daylight and social cues, for example when meals are eaten. However, when traveling across multiple time zones rapidly (i.e. by jet flight), these influences now occur at times different from what the body is expecting, and this mismatch can result in problems.