How do you tell if you have jet lag?

Fatigue, mild nausea: Jet lag occurs when you travel east or westbound. Typically you feel fatigued, mild nausea, and have trouble with sleeping. It lasts a few days, often worse on the first day. Get out into sunlight and take melatonin if you are having trouble sleeping.

Jet Lag: Jet lag symptoms: Fatigue or sleepiness, decreased concentration, moodiness, GI changes (diarrhea, nausea or constipation), sense of not being well & sleep disturbance (insomnia or early morning waking).