I had several experiences similar to what you mentioned about 8 years ago when I was doing some astral projection exercises, they always happened just after I fell asleep and that high pitched buzzing sound is exactly like you described. I remember sometimes I would wake up with a terrible headache after this happening. One event that really was sort of funny was the first time I actuallly projected in a waking state, It was a bit scary but exciting because it was the result of lots of effort over several months. I was in a basement and lying on a bed, "I" left my body, went through a wall into a workshop, then up through a floor, I remember it feeling like I was going through a screen or something.. anyway, there was a kitten in the laundry room and when I went up through the floor that's where I went, the kitten freaked out, freaked me out, and I "snapped" back into my body immediately.
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