jet lag on white

fatigue sleeplessness exhaustion disorientation drowsiness time zone travel sleep disruption circadian rhythm symptoms recovery adjustment disturbance traveling body clock melatonin insomnia tiredness daylight adaptation cycle alertness duration difference air trip traveler crossing zones discomfort restlessness nausea headache dehydration irritability difficulty concentrating grogginess appetite jet setter disturbances long-haul flight sleep-wake disturbed patterns deprivation