Why do I suddenly fall asleep while sitting?
https://www.smartfinil.net/product/modalert-200/
A neurological condition called narcolepsy, which results in excessive daily sleepiness and uncontrolled sleep bouts, may be the cause of sudden drowsiness when sitting. Even when sitting, working, or conversing, people with narcolepsy frequently fall asleep without warning. This may be hazardous and interfere with day-to-day activities. Modafinil, also known as Modalert 200, is occasionally administered to treat narcolepsy patients' excessive daytime drowsiness.