Well, they're all demons. It's not random. Those are real spiritual entities.
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One time i was having a lucid dream that I was in a plane crash and I woke up unable to move. I felt like there were hands on my shoulders and thought my mom had heard me yelling in my sleep and come in my room to check on me but when I tried to say "mom?" I could barely get any noise out of my mouth. Once I regained the ability to move, the hands were gone. No one was ever in my room.
It's probably more likely that its your mind playing tricks on you. The irrational and fearful human brain is a very powerful thing.
I had them from 3 to 30 years old, it stopped when I consciously returned to Church and Sacraments. Without it, we're open to any kind of demonic activity and experience something in miniature we're gonna experience if we die out of faith. Hell is the permanent nightmare, a helpless state with a presence of demons and unability to fulfill your bodily passions and desires.