It could have been that they were outside & howling while you were sleeping. I know that sometimes when things are happening around me it actually goes into my dreams if I'm at that state in my sleep.

I had coyotes at the farm across the street which is actually several miles of acreage.....but I had my eskie dogs out on a long line while I was also working outside. Of course, Leo was barking at them.....inviting them to come......so I raced to get them into the house.

During the ice storm they were yelping on my own farm sounded like right outside of my bedroom window......I know if I did much dreaming that coyotes would definitely be something I would dream about because I'm so afraid of the damage they can do & the braveness they have of NOT being chased away.