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Definition
By Mayo Clinic staffJet lag, also called time zone change syndrome, is a sleep disorder that can affect anyone who quickly travels across multiple time zones. Jet lag is caused by a disruption to your body's internal clock or circadian rhythms — which tell your body when it's time to be awake and when it's time to sleep. The more time zones crossed, the more likely you are to experience jet lag.
Jet lag can cause daytime fatigue, an unwell feeling, difficulty staying alert and gastrointestinal problems. Jet lag is temporary but it can hinder your vacation or business travel. Fortunately, there are steps you can take to help prevent or minimize jet lag.
Symptoms
