I always create a separate space for where I will work and where I will not. This psyches you up when you need to accomplish stuff. Try to make that work space far or at least separated by a door.
Organizing your time just simply means just follow a To Do list every day. You get to do more and fretting things about stuff you forgot doing is avoided.
Another thing is to keep yourself active. Don't follow what I used to do and just sit all day in front of the computer. Take exercise breaks. I usually walk a few steps up and down the stairs for ten minutes. It also helps to clear your head. And watch what you eat.
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