co.1nspire said:
I've had these a few time while falling asleep. The instant I'm slipping into a deeper state of sleep after just consciously laying there very relaxed I'll be shocked out of it and awake again by a buzzing zap. Its like sound is being stretched out in the matter of a moment to slap me back to awareness.
There was a period of time, a few months ago, when this happened to me. These "brain explosions" began to happen to me before my first experimentation with nitrous oxide, my first recreational dabbling in drugs of any sort, so I can't attribute them to that. They were quite startling and uncomfortable. There was a point in my life where I was almost afraid to close my eyes and try to go to sleep, for fear of being startled by this flash of light, loud explosive noise, and body spasm.
For awhile I believed that they might have to do with a decongestant that I was prescribed awhile back, for my allergies. Awhile after I had been taking this medication daily, I starting feeling very very strange and disconnected from reality, like I was watching my life go by on a TV show, and I couldn't even control myself. I stopped using the decongestant, and these feelings instantly vanished. I believe that it was around this time that my "brain explosions" started happening.
I looked it up on the internet, and found a website that had an interesting theory on brain zaps occuring during sleep. I don't know exactly where I read it, but the theory was that sometimes brain zaps were an innate utility the brain has to wake itself up in an emergency. Our ancestors that slept in trees depended on these brain zaps to quickly and forcefully awaken them if they began to fall out of their tree. So the website theorized that a brain zap could be caused by a dream in which you begin to fall.
In any case, I have learned to avoid them, strangely enough, by sleeping on my side instead of on my back. I don't know if the position of my head relative to gravity is what causes the explosions to occur or not to occur, but I'm glad that I can fall asleep most nights without the explosions.