I have had it but even as a child so it is not alcohol related. It is where I would wake up and know I was awake but could not move a muscle..very scary. I am not sure but it ended in extreme panic and I would finally come out of it flailing around. I have had it like maybe 3 times in my life. Don't even like talking about it. Never want to experience it again. I don't know what causes that..or if it is something others have had but do not talk about? I don't remember dead relatives visiting tho...