My psychology teacher told me about an experiment where they let a person be completely sensory deprived, he was laying in some kind of box that made him unable to move and he was laying in complete darkness. I don't know howw they solved the food problem, but this guy lay there for two days! At first he was just thinking and sleeping the whole day, but on the second day he started to hallucinate and he started to dream awake in that sense. So they had to stop the experimet to not risk his health.
I guess that's an extreme version of this technique

Bookmarks