Last night I WILDed (succesfully, I believe, but that's another thread)... I noticed that as I lay there listening to my breathing, I began to hear short clips of high pitched (or rather, high frequency) noises, in my head. I get these quite commonly, and was unsure if it was envioronmental noise or just me going crazy. Anyway, last night I heard these as I was trying to WILD... and as I slipped further & further into sleep, I noticed that these vibrations were slowing down... slowing down... & as I felt the "vibrations", the noises were quite low frequency (down to about .5-1 Hz) & after the vibrations stopped, so did the noises, & I was left staring into an empty void.

My question is: am I going crazy? Has this happened to anyone else? Or is it possible that I can "hear" my brain waves shifting from the alpha range all the way down to the theta range while still remaining conscious?