Had a nightmare last night and remember I had fell asleep with my watch on so I went back to see if…

Had a nightmare last night and remember I had fell asleep with my watch on so I went back to see if my dream was making my heart raise for real like it did when I was dreaming. Crazy it was up then dropped then went high and stood like that till I woke up by 1:40 from it. I woke up anxious and didn’t sleep for almost 2 hours