Jerry, it really sounds like you are serious when you say you don't understand how other people's misery can make others laugh. I cannot answer this question for you. But, I know that it makes me laugh, I am not mean-hearted or narry a nasty bone in my body, but these things make me laugh. Do they seriously not make you? Maybe those sleep issues have affected you in different ways. I think that good belly laughing at things that happen to people are good. Now and then there are times when things are so awful that they are not funny, and most people don't laugh, they just say something like "awe, oh no", only certain bad things that happen to people are funny and there is a fine line. Have a wonderful and greatest of day. Cindi
I find a lot of things funny. If, in a sit-com, the actor is (fake) injured, falls, or what ever as a gag, then I might find it funny. (if done right)
I hope my humor shows through in some of my post here. (someone once said they liked my humor

)
BUT.....
I have witnessed people falling and everyone bursting into laughter. My first concern is to get over there and make sure the person is OK or help if help is needed. The victim might even give a chuckle while they themselves don't find it at all funny. (Forgot what that sort of natural reaction is called.)
Back in High School we had a Peep Rally inside the auditorium (bad weather) we were all standing when a guy across the aisle and two rows in front of me jumped up and over the arm rest of his seat and landed in the aisle. Students laughed as he lay there twitching from an epileptic seizure. I found nothing funny about that.
My wife watches a lot of those shows like "Country fried home videos" and "America's funniest videos" and.... umm... I think there might be another.... and her and my daughter will sit and laugh and laugh. Yes I know these were sent in because the people involved thought they were funny ...but.... at first on each incident I feel the person's pain. I then wonder what the person was thinking and worry about the course of the human race. AND THEN..... I have to wonder why someone would put that out there so the world can see what idiots they are for doing that stupid stunt, and yes I feel sorry for them.
I added "I must be an alien" to the title because I have been thinking about starting a series with that title. It is about how I feel different from people and how I do not understand people. Watch for more titles of "I must be an Alien" some will be interesting. Some will be funny. And I am sure that some of them are really gonna make people mad at me. And a few might make you want to report me to the looney bin .