Well I get off work at about 2:45pm which leaves ~5 hours of daylight after work. I go to bed at about 9pm and feel much better than I ever have energy-wise. You can argue that these were not choices I got to make, and maybe I just have stocklholm syndrome, but I sure do not miss browsing the internet until late into the night and waking up groggy every day. Plus on the weekends I wake up with the sunrise, which actually is sleeping in for me, and get much more out of the day. If you have flexible working hours I highly recommend forcing a schedule like this on yourself for a few months. I think most people would find they feel much happier and energetic.