You are telling a joke to your friend who is laughing uproariously and then suddenly collapses to the floor. You are not surprised to later learn that he has a sleep disorder known as

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Narcolepsy is a sleep disorder characterized by sudden and uncontrollable episodes of falling asleep, often triggered by intense emotions or laughter. Therefore, if a person with narcolepsy was laughing uproariously and suddenly collapsed to the floor, it would not come as a surprise.

You Are Telling a Joke to Your Friend Who Is