Water is a pretty legit thing to have nightmares about. Mine tend to vary, though a lot of them tend to run in the vein of being alone.
In defense of my burger nightmare, that wasn't actually mine technically. That more belonged to the Fae that I was linked with because I could tell it wasn't my hunger, it was hers. I suppose it makes sense because she would've turned my brain to mush if I'd stayed asleep long enough.