Common sense and experience inform my theory of good sleep: Pitch black, stone quiet, with noise limited to pre-sleep audial approximations of the dream-like mental noise that precipitates sleep.
Glad that works for you! To me, silence sounds a lot like insomnia.
> -sleep audial approximations of the dream-like mental noise that precipitates sleep.
What does this mean for you?
My hypnagogia, or mental-noise that precipitates sleep as you put it, is entirely visual hallucinations.
I’m not aware of ever having been able to recall any auditory hallucinations.