From my own experience, there are several things that worked: -A good, healthy sleep schedule. 8 hours in one sitting (laying?), sensibly at the same time every day, and don't let it start or end too late. -Music. Anything you like. If you can listen to it while working without getting distracted, i...

Done, I hope it'll help! It's true that it's a big issue that isn't talked enough about...