An executive's company requires her to engage in a lot of long-distance travel. At first, after a long trip she would experience fatigue, uncontrollable sleepiness, and a disruption of her sleep-wake schedule that would continue for days. She probably was experiencing

Jet lag

Explanation:

Jet lag is a temporary sleep disorder that affects individuals who can travel across several time zones. In this case, the internal clock of the body doesn't conform to the new time zone thereby leading to a sleeping disorder.

An executive's company requires her to engage in a lot of long-distance travel. At first, after a long trip she would experience fatigue, uncontrollable sleepiness, and a disruption of her sleep-wake schedule that would continue for days. She probably was experiencing jet lag.