Something which happens to me fairly regularly is this: After going to bed, switching off the light and closing my eyes, I begin to feel myself drifting off to sleep. Then after what feels like half an hour or so I’m suddenly aware of a loud rushing sound in my ears, a bit like the sound a large waterfall might make if you were standing close to it. I am concious at this time and aware of what’s happening. This makes me feel disorientated and confused, and I wake myself up with a jolt. On waking I am breathless and can feel my heart beating quite fast. I also have a very odd dizzy feeling in my head for 20 seconds or so. I then calm down and eventually fall asleap again. I assume I’m in a state of not being fully awake or fully asleap but I’ve never been able to explain the experience.
Last night I spent the evening reading about lucid dreaming. I went to bed and after closing my eyes I repeated the words “I’m going to have a lucid dream” to myself. After a short while I got the rushing sound again. I remembered something I had read earlier about staying calm during lucidity (although I knew I wasn’t having a LD). I managed to calm myself down slightly and listened to the sound. I noticed it was changing slightly in volume at regular intervals like it was sort of pulsating. I could feel the bed under me, and could feel myself lying in the same position I was in when I had gone to bed. I decided to open my eyes and could see the bedroom dimly lit by the street lighting outside, except that it appeared slightly distorted or mis-shapen, as if I was looking through very thick glass. Although I was lying on my right side, I was aware of myself looking around, above and to the left of me, even though I somehow knew that I was not moving my head. This alarmed me and I closed my eyes again. I then woke up with a jolt, and had the usual fast heartbeat and breathlessness, although no dizzy feeling this time.
I’d like to know what on earth causes this rushing sound and what does it mean? Also what should I do next time this happens? Can I use this state to induce a LD? I read somewhere that a rushing sound is a sign of an OOBE. Should I be exploring this rather than trying to have a LD? Any help or advice apprecited.