Every once in a while I have a dream that reminds me of the movie Lock, Stock, and Two Smoking Barrels. It's the kind of dream where something bad happens, and then my reaction makes it worse, then something else makes it worse until I wake up and remind myself that the whole thing was a dream. Sometimes, I have to actually get out of bed and move around before I fully realize it didn't happen and no police, hospital visits, funerals, etc., will be involved.
They do not make for a very restful night. Fortunately, I only have one or two of those per year.