Lately, almost everyday, I've been having these nightmares. The best description I can give them is having a panic attack while sleeping. Basically I feel like I'm dying while sleeping. All is dark and I feel like I'm being pulled into a void of nothingness, into a bottomless abyss and I keep going down and down. I try to scream to wake up but I can't scream and I can't move and it goes on for what seems like long minutes of panic and despair.

When I was younger, I used to have the same dream, except there wasn't a void and more like I felt multiple arms dragging me (hairy arms, like a giant tarantula) and I could see the room I was in, like I was awake, except I wasn't.