There have not been sufficient studies to make conclusive statements about how common or who is most often affected. One study found that 14% of a sample of undergrads reported at least one episode over the course of their lives, with higher rates in those who also have sleep paralysis.
Exploding head syndrome
Otodental syndrome
Hypnoid state
Emergence delirium
Diencephalic syndrome
Perisylvian syndrome
Brain herniation
Myxedema coma