I expected it to be either swallowed, or in my hair or on the pillow or something.

I think I also woke up several times in the middle of the night, chewing, and really confused.

And then I had a dream I stole all the food in someone's fridge and concocted a strawberry surprise for everyone. Idek.

so the moral of this story is if you go to bed with gum in your mouth, expect dreams about food and eating.