I used to suffer from sleep paralysis pretty regularly, to the point where it didn't freak me out anymore and it was a case of breathe, relax and try to shake out of it.
The last time it happened though... I had an experience that was almost a direct copy of the sofa scene in Paranormal Activity 2 (I hadn't seen the film at the time).
Basically, I was dozing on the sofa covered by a thin blanket when I found myself pinned down while an indistinct black cloud slowly crept up from the other end.
What really **** me up was that I could feel the weight of it pressing on the blanket as it moved forward. It got to about my waist before I managed to fully wake up.
Was sweating buckets and bricking it
I'm perfectly happy to put it down to a simple sleep paralysis episode and tbh, I bloody hope that's all it was
As for seeing black shadows... **** THAT!
EDIT:
Not creepy, but I've also seen a few distant UFO type things. Nothing spectacular, but definitely not normal.
They were all distant lights in the sky pulling maneuvers and speeds that our planes just couldn't do. Test planes/aliens? I dunno. Definitely not shooting stars or satellites.
The standout sighting was when I was up on the roof at my old house on a very clear summer night and I saw a formation of at least 9 points of light moving across the sky. They were all bluey-white (like stars) except for one reddish dot. All fairly explainable so far until one of the dots hung back for a few seconds before it sped up and rejoined the rest of the group and matched their pace.