Only in sleep where theres nothing but mind can the mind clearly process all of the days experiencesmemories - without distraction. And perhaps only in sleep where theres nothing but mind can the mind truly understand the meaning of these memories as well and assimilate them with all the other memories youve accumulated over time forming greater meanings - unintelligible in the light of day - building perhaps to some ultimate meaning at the culmination of life - unintelligible in the light of living.