We all just have to accept that in our real lives we are usually giant fruits asking what age a flying monkey can have for dinner in africa after spending all his money on cheap hookers and bannanas.
In a really good trance you should only be aware of the hypnotist's voice, that's all. It should feel like you are floating because there should be no sense of your surroundings or even your body. I think more generally it is : A feeling of nothingness... just a voice telling you to do something or ...