bhp91126 saidA little time before falling asleep I feel a light electric jolt go through my body, some muscles spasm momentarily and then I'm off to sleepy land.
That can be an occurrence on your way to an altered state of consciousness. Simply put, if you are not already, the "electric shocks" you describe could mean that you could pretty easily become a lucid dreamer. Many lucid dreamers describe them similarly early on in our dreaming experiences. I recall having them when I was a kid.
To the OP's point, I'm very aware of when I'm about to sleep and at times when I'm up on my dream yoga practice, I can consciously put my body to sleep, formulate dreams, manipulate them, destroy the dreaming and reawaken my body without ever losing consciousness during any of those steps.
It is not unusual to have sort of a pre-dream on falling asleep--that happens sometimes to me too--then consciousness awakens the body and then you fall back to a deeper sleep. Combine that with hypnagogia, the state between being awake and dreaming, and you could very well experience a sort of auditory hallucination of a dream character speaking which sounds to the person having the experience as real as any real voice might to an outside observer, only the "sound" is strictly subjective, of course.