From time to time I suffer from sleep paralysis. my 1st time I just heard what sounded like it was raining sand or something(1999-2000ish). It was a little scary, but after that I just learned to deal with it; more of an inconvenience than anything else.fast forward to 2009 I woke up unable to move, and a I heard a voice say, "Whats up man"?The voice could have been a soft spoken man or a woman(best friend left earth in 2008 had such a voice).What really freaked me out though is after I heard the voice, I felt something sit down on my bed towards my left foot.I was less than pleased and didn't go back to sleep once my body woke up. Science has an explination for it, but I don't know if I buy it.