I don't really understand what they are.. but I have been told these 'dreams' I've been having (I'd see them as nightmares) are lucid dreams.
I had my first about 8 months ago in which I was in bed and there was a figure of a man standing over my bed, but I was pinned down and couldn't move or scream, my 2nd happened about 4 months after which was the same being pinned down in my bed not being able to move or talk but this time it was like someone (a spirit) was trying to take my bra off and was touching me.
and I had another one last night which was again being pinned in my bed not being able to scream, I felt my bed move as if someone was getting on it but I knew I was home alone so it didn't make sense, then it was like I started having a fit and was being choked.. whilst someone was shouting aggressive things to me, I couldn't make out what was said though. I had to try and wake myself up by widely opening my eyes in my dream as I couldn't move anything else, I woke up sweating but freezing cold.

if someone could explain this to me I'd be so grateful, I'm scared to go to sleep.