Let me preface this: I am not insane.
That being said, I have had three encounters with "voices" or "feelings" or "phantasmas" in the past year. All three of them occurred while I was on the verge of consciousness-- not quite asleep, but definitely not awake either. If I remember correctly, at least two of them happened when I fell asleep with the lights on (I must have been reading before bed).
In order to maintain a degree of credibility, I need to chose my words carefully in attempting to describe the first "feeling". Ok, I was lying in bed and I felt a "demon-feeling" over me. The oddest thing is that I "saw" it too. The best way to describe this thing that I didn't see, but kind of felt or saw in my head, was that it looked like a lamprey. Yeah, that eel-like jawless fish.
(see picture here: http://library.thinkquest.org/03oct/00946/pic_used/sea_lamprey.jpg)
I "saw" that type of circular jaw-sucker thing over my face that night. There were no sounds. I even tried to move away or fight back, but I was frozen in bed unable to move.
The second "feeling" was that I was being choked by a person holding a bar of iron or metal to my throat. Again, I couldn't move. Except this time, I got so pissed that I kind of lurched up and attacked the air. In a way, I broke through that catatonic state and regained consciousness, somewhat abruptly.
The third sensation happened three nights ago. I don't want to go into too much detail, as it is a sensitive subject. But, to put it simply, I heard my dead grandmother's voice calling my name, three times.
I need a vacation.