Further to my comments about PKD I would like to make the observation that without his extreme perceptions PKD would not have written the amazing stories and novels that he did. In many ways I believe a part of him was fully in controll during this tim ..... a being that was to manifest into PKD' consciousness as VALIS, AI and Sophia (as he was to call this entity over a period of a few years).
Phil, in his autobiographical writing, had long claimed that he had been diagnosed as suffering from a form of schizophrenia. I have read three biographies and I have never read any confirmation of this. However it is clear that there was something within his psychi that had opened up the "doors of perception" within him.