Adjusting to a new time zone can take up to a week and the more time zones you cross, the longer the adjustment period. Symptoms include daytime fatigue, nighttime insomnia, headache and disorientation. Lengthy travel may upset your circadian rhythm which controls various body cycles, including the production of a hormone involved in sleep patterns (melatonin). One strategy to prevent jet-lag is to change your sleep time closer to the new time zone over a period of several days; adjust go-to-bed and get-up times appropriately, so that you will be only slightly out of sync when you arrive at your destination.
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