Tank you very much for your answers.

About hearing voices, this is something I can easily produce "random voices saying random sentences" when I am near to fall asleep (but I nearly always finish by loosing consciousness), I just have to "try to listen to the voices" and soon it begins.
I can do it at bedtime (which is useless) or at a WBTB.
For example I read a book until I feel I could fall asleep in seconds, then I turn the light off and try to focus on the voices and random voices at random volume level start to say random short sentences.

So far, I have not been able to WILD from this states cause each time a voice goes off a little bit more loud and realistic than the other ones, it seams to surprise me and break the relaxation, wakes me up and prevent me from gently enter in a dream.. (the other issue is the N-REM barriers NFri evoked in some posts on the forum)
BUT, I am pretty sure I could use this phenomenon as kind of check point, I mean a a clue on where I am within the Sleeping process, and from that temporal check point, If I had the good timing information I could use for example a certain delayed auto snooze alarm (My Gymboss Minimax for example) to bring me back from wherever I am (slow sleep or REM) on a particular moment from which I could easily WILD/DEILD in a minute.

What I just miss is EEG monitoring, and a lot of tries.
I could do it without EEG but still with a bunch of tries anyway.

By the way I am not sure to remember that Raduga speaks about Auditory hallucinations in his book.