Of all the things a man may do sleep probably contributes most to keeping him sane. It puts brackets about each day. If you do something foolish or painful today you get irritated if somebody mentions it today. If it happened yesterday though you can nod or chuckle as the case may be. Youve crossed through nothingness or dream to another island in Time.
Have you ever noticed how when youre happy time seems to pass by fast while when youre miserable it goes real slow Life would have been a blink with you whether it lasted a millennium or a month.