If death Knights can sleep, can they dream? Headcanon on what they would dream of?

I figure they can. For a while, particularly after he started sleeping, Tev would end up dreaming of all the dudes he murdered while he was still with the scourge. That sort of thing would probably be agonizing to any death knight that is normally horrified by what they did with the scourge, but Tevruden isn’t particularly regretful.