In my thirties I was addicted to valium. Valium is a tranquilizer and its very addictive. I used to have anxiety attacks and I was allowed to have this drug handy at all times.
OK it caused sleep paralysis. Your brain would be awake but you couldn't move a muscle.
These episodes had two characteristics. Youd be laying there and it would feel like someone had you in a bearhug. Then you would gradually be able to move. When you did move you would be exhausted and fall asleep again.
I eventually got off of that s*** and joined the real world.