One of the biggest changes in my life when I left my job to work on my startup was the freedom to not be pinned in a chair from 8 AM-5PM. If I get tired, I go t

One of the biggest changes in my life when I left my job to work on my startup was the freedom to not be pinned in a chair from 8 AM-5PM. If I get tired, I go take a nap. If I get stiff and sore, I go for a walk. If I can't think, I go do something else. The net result is that I'm able to be productive 100% of the time that I actually am working, and I can work more than I could otherwise, if so needed. If you have the luxury to set your schedule, listen to your body, do what it asks, and you'll find yourself operating much more smoothly than you're used to.