I hate how the human mind has to be taken care of in order to be productive. You can't just sit down and study, practice, program, draw, etc. You need to be in the right mindset and you need to take breaks. I just wish it worked when I want it to work.
@beardalaxy It's just the littlest of things that affect your productivity. Having a clean room, not using the same location that you normally use for recreation, having to take breaks but not have those breaks go overboard, getting good exercise, etc.