[Jet lag syndrome].

Jet lag is a travel-induced circadian rhythm disorders. Symptoms of jet lag include difficulty sleeping at the new sleep time, daytime sleepiness and fatigue, and impaired performance. Treatment of jet lag includes both behavioral and pharmacological component. A short-half-life benzodiazepine hypnotic for several nights at the new sleep time have been recommended to decrease jet lag symptoms. Melatonin also can alleviate jet lag and bright light exposure is a useful countermeasure for jet lag.