I have tried to read up on this phenomenon after it started to happen to me. I'm not entirely sure if it is a mental health disorder, but what ever it is, it's a horrible experience. First time it happened to me I was aware that there was such a thing (as a kid I was interested in alien abductions that some mean might have been sleep paralysis). I'm happy I knew what I knew... but it was still so scary. I woke up facing the wall and couldn't move. My eyes were open and I seemed to be able to think somehow rationally. I saw the shadow being cast from a man and could hear him walk around my flat. He looked in my bag, and tried to take my TV. Then he calmly walked out of the door... While it happened I tried to tell myself that I was having a sleep paralysis, but it didn't help me to wake up. Then I could finally move and started to shake. I double checked everything, nothing had been touched and my door was still locked. Since that happened my anxiety has gotten a lot worse. When it gets dark I am scared of every shadow and sometime just get gripped by a fear that there's someone or something in the room with me. I've often had to hide under the covers and hold onto my Sonic Screwdriver to defend myself with (feel free to giggle). Some months ago I had another, I had some trouble sleeping and woke up in the middle of a pretty psychedelic dream and wanted to sit up, but I couldn't. I was scared someone was in the room, but the angle I was in didn't allow me to look around. My arm was hanging over the edge of the bed... and I still have the irrational childhood fear that there's a monster under there. For some reason my mind actually decided to help me. I felt something furry and warm brush over my arm and decided that it was my dog. (My dog lives far away with my mum!). Have anyone had these dreams happen to them? And is there any tips to avoid them? And also... I can't help but worry about more sinister mental health issues... my best friend is schizophrenic... and I read in my file from last time I received therapy some years ago that they had tested me to see if I heard voices.