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Jet Lag (cont.)

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What is the role of melatonin in jet lag?

Melatonin is a hormone that plays a key role in body rhythms and jet lag. After the sun sets, the eyes perceive darkness and alert the hypothalamus to begin releasing melatonin, which promotes sleep. Conversely, when the eyes perceive sunlight, they tell the hypothalamus to withhold melatonin production. However, the hypothalamus cannot readjust its schedule instantly; it takes several days.

Does the direction of travel matter?

Yes. Travelers flying north or south in the same time zone typically experience the fewest problems because the time of day always remains the same as in the place where the flight originated. These travelers may experience discomfort, but this usually results from confinement in an airplane for a long time or from differences in climate, culture, and diet at the destination location. Time differences do not play a role.

Travelers flying east, on the other hand, typically experience the most problems because they "lose" time. For example, on an international flight from Washington, D.C., to Mecca, Saudi Arabia, a traveler loses eight hours. Meals, sleep, bowel habits, and other daily routines are all pushed ahead eight hours.

Travelers flying west "gain" time and usually have an easier time adjusting than eastward travelers. However, they too experience symptoms of jet lag after landing because they still must adjust to a different schedule.

Do the symptoms of jet lag vary in intensity?

Yes. People flying across only one or two time zones may be able to adjust without noticeable effects of the time change. Those flying across three or more time zones will likely develop noticeable symptoms of jet lag. Generally, the intensity of symptoms varies in relation to the number of time zones crossed and the direction of travel. People also vary in their susceptibility to jet lag symptoms and the severity of the symptoms.

Medically Reviewed by a Doctor on 4/11/2014

Patient Comments

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Jet Lag - Remedies Question: What remedies have you found helpful for jet lag?
Jet Lag - Symptoms Question: What symptoms do you experience with jet lag?
Jet Lag - Coping Question: In what ways do you deal or cope with jet lag? What advice would you give to someone who needs help?
Jet Lag - Melatonin Question: Have you taken melatonin supplements to prevent jet lag? How does it help?
Jet Lag - Direction of Travel Question: Do you notice a difference in jet lag symptoms depending on the direction in which you travel? If so, explain.
Source: MedicineNet.com
http://www.medicinenet.com/jet_lag/article.htm

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