Jet lag: A temporary disorder that causes
fatigue, insomnia, and other symptoms as a result of rapid
air travel across time zones.
Other symptoms of jet lag include anxiety,
constipation, diarrhea, confusion, dehydration, headache,
irritability, nausea, sweating, coordination problems, and
even memory loss. Some individuals may report additional
symptoms, such as heartbeat irregularities and an increased
susceptibility to illness.