Even the most capable passenger can be incapacitated by one drink too many, which could put lives at risk. They also note that it's unwise to sleep in the emergency exit row. Because, well, it's the emergency exit row.

Technically, you are allowed to sleep in an exit row, but there are significant safety-based caveats. To sit in an exit row, you must meet specific "Exit Row Requirements," which include being physically capable and willing to assist the crew in an emergency. If you are a heavy sleeper who cannot be easily roused, you might not be the best candidate for this seat. During taxi, takeoff, and landing, you must be fully awake and alert. Additionally, many airlines have a "clear floor" policy for exit rows, meaning all your belongings—including blankets or pillows not in use—must be stowed in the overhead bin. If you do sleep during the cruise portion of the flight, you must ensure your seatbelt is visible over your clothing or blanket so the crew doesn't have to wake you during turbulence. If you appear too groggy or incapacitated to perform emergency duties, the cabin crew has the legal authority to reseat you for the safety of the aircraft.