I suppose there are a couple different kinds. As hard as it is to categorize them, I can try at least. Some have more to do with games or gifts or holidays which usually just end it disappointment.
Most others I guess would be nightmares, only they aren't exactly typical, or your normal average every day scary stuff. My dreams tend to be very abstract, almost to the point where I just don't understand them, even if they are reoccurring. I have made sense of some of them though. There was one particularly long one that was very memorable, wherein I killed an ex girlfriend, and that has been the most obvious.
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About suffering they were never wrong,
The Old Masters: how well they understood
Its human position; how it takes place
While someone else is eating or opening a window or
just walking dully along...