I induce them on myself because I think the psychology behind them is cool
I think of a word or phrase over and over again in my head, and if im tired enough, soon I will begin to hear a faceless voice saying the word or phrase out of the darkness, seemingly being picked up by my ear, at times i even hear the echo of the word or phrase bouncing around my apartment
awesome stuff
P.S. If you want to try this, starting with your own name works the best