You don't like a slow-to-start computer, do you?
Your brain doesn't like it when you don't work.
It feels insulted to be sitting caged in a rusty body.
Time is your friend- cherish it.
Don't while it away in nothingness.
You're wasting a lot of your energy in that, too.
When breaks get too long, you fail to work, thereafter.
The logic is simple- you're tired.
Think of the stupendous feats you want to accomplish.