Sleep is vital, and can also beneficial if you time it correctly. 1. Super motivation. When I'm working on a project that has me pumped, then time flies and I

Sleep is vital, and can also beneficial if you time it correctly. 1. Super motivation. When I'm working on a project that has me pumped, then time flies and I can keep going until I physically pass out. 2. Brainwave Entrainment. Google it. I listen to a certain audio recording for 30 minutes, and I'm refreshed for another 2-4 hours. Net gain. As for the timing of sleep-- your subconscious is a very powerful tool. If, just before going to bed, you ask yourself all the questions and todos that are on your mind (write them down), then as you sleep you brain will work overtime to consolidate your experiences and to derive solutions. When you wake up (google Polyphasic Sleep to put the sleep method on steroids) and take a walk or shower, you may find that you have a lot of new ideas or solutions for the problems you were tackling.