yea thats a good question....

i've only had one dream like this and it was scarey.
I thought i woke up from sleeping but i guess i wasn't fully awake. and it felt like someone was hold down my left wrist and pushing down really hard on my chest and i couldnt breathe.... it lasted for awhile until i jumped out of my bed and gasped for air.

i feel bad for my sister because she always has these dreams.