Thanks purjo.
I'll try that tonight. But I have one remaining problem. You'll probably understand me.

While I'm getting images (hypnagogic state), I usually tell my self "I have to go to the toile 1 more time'. I usually follow that negative statement. It is the feeling.. not the pure statement so that I really can't change its tone since it's not the voice !! When this happen around 5 times , you know, I get very annoyed and it causes BIG STRESS! which make me unable to fall alseep. What should i do with this annoying thought that I have to go to toilet when I feel very sleepy (hypnagogic). When in the hypnagogic state and then get disturbed , this cause big stress.... huhh... please help.