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

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The symptoms described are characteristic of jet lag, which occurs due to rapid long-distance transmeridian travel, causing a mismatch between the individual's internal clock and the new time zone, leading to fatigue, sleepiness, and sleep schedule disruptions.  Jet lag is an indication that the internal circadian rhythm is not in phase with the environment. Two variables that affect development of jet lag are the direction of travel and the number of time zones through which you travel.

An Executive's Company Requires Her to Engage in a Lot