You can boost it by eating chocolate or other high-energy foods, but all digestion takes some energy and you aren't replenishing the brain benefits of sleep/rest (and you'll probably start packing on weight if you do it daily...).
I have found getting out of the office for some exercise after a good morning session can get you a good hour or two of similar focus/concentration when you return (again, you must get right on task). It's not the same quality, a squirrel running down the wire out my window can easily take me off task, but I'm in the bonus round for the day, anyway.
I have found getting out of the office for some exercise after a good morning session can get you a good hour or two of similar focus/concentration when you return (again, you must get right on task). It's not the same quality, a squirrel running down the wire out my window can easily take me off task, but I'm in the bonus round for the day, anyway.