“which is the waking and which the sleeping life?”

 “when we are dreaming and, as often happens, have a dim consciousness of the fact and try to wake, do we not say and do things which in waking life would be insane? May we not then sometimes define insanity as an inability to distinguish which is the waking and which the sleeping life? We often dream without the  least suspicion of unreality. ‘Sleep hath it’s own world’ and it is often as lifelike as the other.”