The mind must be given relaxation — it will rise improved and sharper after a good rest. Just as we must not force fertile farmland, for uninterrupted productivity will soon exhaust it, so constant effort will sap our mental vigor.
Give me the splendid silent sun with all his beams full-dazzling, give me juicy autumnal fruit ripe and red from the orchard, give me a field where the unmowed grass grows, give me an arbor, give me the trellis'd grape.
You must sleep sometime between lunch and dinner, and no halfway measures. Take off your clothes and get into bed. That's what I always do. Don't think you will be doing less work because you sleep during the day. That's a foolish notion held by people who have no imagination. You will be able to accomplish more. You get two days in one — well, at least one and a half, I'm sure.