In order that a "self" may exist there must be some continuity of mental experiences and, particularly, continuity bridging gaps of unconsciousness. For example, the continuity of our "self" is resumed after sleep, anaesthesia, and the temporary amnesias of concussion and convulsions.
In 1991 I did an interview wherein I described myself as a 'teetotal Christian,' which was an exaggeration, although I do like tea and Christ.