Mother Night Indeed

 'The experience of sitting there in the dark, hearing the things I had said, didn't shock me. It might be helpful in my defence to sat that I broke into a cold sweat, or some such nonsense. But I had always known what I did. How? Through that simple and widespread boon to mankind - schizophrenia*.'. 

Quoted from page 116 of 'Mother Night' written in 1961 by science fiction writer, satirist and essay writer Kurt Vonnegut Jr (1922-2007). Here is the writers website.

*A long-term mental disorder of a type involving a breakdown in the relation between thought, emotion, and behaviour, leading to a series of faulty perceptions, inappropriate actions and feelings, withdrawal from reality, and a withdrawal from personal relationships into fantasy and delusion. Overall a sense of mental fragmentation. It may well seem like a rational response when reality seems to be complex to the point of being intangible.