Answer:
Jet lag
Step-by-step explanation:
Jet lag is a sleeping disorder that occurs when a person's internal clock is out of sync with a new time zone they travel to.
It occurs when people travel quickly accross time zones.
For example if one is used to sleeping every 12 hours and he travels accross 6 hours time zone, he will be feeling sleepy when there is daylight in the new location.
In the given scenario the executive is experiencing jet lag in form of fatigue, uncontrollable sleepiness, and a disruption of her sleep-wake schedule that would continue for days.