A Perfect Master is consciously united with the infinite Reality. In his case the chasm between consciousness and unconsciousness is bridged, not by the extension of the unconscious over the conscious (as with the person who enjoys deep sleep) but by the extension of consciousness over unconsciousness. The waxing and waning of consciousness is applicable only to the limited individual. In the case of the Perfect Master, the conquest of the unconscious by the conscious is final and permanent; and therefore his state of Self-knowledge is continuous and unbroken, and remains the same at all times without any diminution. From this you can see that the Perfect Master never sleeps in the ordinary sense of the word. When he rests his body he experiences no gap in his consciousness.
-Discourses 7th Ed., p21