If there is something like spirits, supernatural, ghosts, any of that crap..

[Dash87]

41. The "sitting down on chest" thing is called "old hag."

I'm not saying this is definitely what you had, but it sounds like it. It's named after "hags" of folklore who would supposedly come in the night and plop down on your chest.

Basically, it's an effect of your body going to sleep or waking. It goes hand-in-hand with sleep paralysis, which may cause disturbing imagery before your body actually wakes up.

Many dont realize that the body and mind 'sleep' separately. We don't realize it because the transition to wakefulness is usually without incident. When ones' mind wakes up before their body, though, they may believe that something is holding them down or sitting on them - whatever hallucination they're dreaming at the moment.