Before going to bed, make a list of what needs to be done at work the next day. That will give you some set goals and prepare you for any new things that come up during the day.

You get use to it after awhile. When you feel like its the "Hare and the Tortoise bit," step back and relax. Try to meet the deadlines, and know that nothing in life is perfect, together all that much, and no real person on the planet can do everything. Tomorrow is another day, and set your priorities. And running yourself ragged never made for a flawless look when old.