Wow , i never really knew what this was , but i had this happened to me a couple of years ago . it was my first night sleeping in my bunk bed . i was
about 7 and just right before i fell asleep i saw a demon type face and it jumped at me and when i awoke my closet door opened . . .
A few times a week I get these all night long. I really pay for it the next day, so basically 3-4 day out of the week I am a walking zombie.
I am usually dreaming something good to when it happens and I get mad that my dream was disturbed.