**5.6 Jet lag disorder (JLD)**

Clinical history is the most important tool. The clinician should specifically obtain information about number of time zones crossed and the timeline of symptom occurrence. JLD is often confused with travel fatigue since there are many overlapping symptoms; however, the distinction is that travel fatigue is not dependent on the number of time zones traveled and tends to resolve quicker.

Since JLD is transient, and clinical history is usually clear, there is typically no role for formal diagnostic testing.
