I use to have it multiple times a month when I was a teenager. Now it's like one time a month or two.
You need to close every room in your appartement that contain water (bathroom, toilet ...) before sleeping. Those "things" come from here.
The scariest experience was when I was 23. Mind you, I always lock my bedroom door before sleeping ok ?
Well, I woke up paralyse in the middle of the night and the only thing I could move (as always) was my eyes, toes and finger tips. I saw a little thing in the corner of my bed looking at me.
Then this thing (looking like hum ... GOLUM) jumped on my chest and I could feel his breath.
Then I managed to scream (it wasn't a scream tho, just a gasp of a little sound because of course, in this situation you can't speak or scream).
At this moment this thing jumped from me and the bed and I saw it run into the toilet and disappear.
I pray as always and I immediately been able to move again.
And ... My door was WIDE open.
With the years i learned to accept this shit and now overtime it happen I just pray, calm myself and it disappear in a few minutes.
I also remember one friend of my who used to making fun of me when I told him the story.
One night he came so sleep because we were going to the airport in the morning. And guess what ? HE GOT PARALYSE AND FELT A BREATH ON HIS FACE HAHHAHAHA !!! I herd him trying to say something and as soon as I touched him to wake him up, he immediately jumped form the bed hahahahaha