601XL Builder writes:

Excessive daytime sleepiness, which is falling asleep when you normally
should not, such as while you are eating, talking, or driving.

Ah, point taken.

The most common cause of sleepiness, though, is a lack of sleep, and
unfortunately a great many people sleep less than they should, and
tend to doze off easily in consequence. I don't know that the FAA
takes this into account (or even how it could), but some cross-country
flights must surely be powerfully sedative in effect.

Does the FAA allow pilots to carry No-Doz in the cockpit?

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