If it's a once (or twice) off: * Go for a run. * Then take a cold shower. * Then dose up on caffiene of your choice. But please don't do stuff like this oft

If it's a once (or twice) off: * Go for a run. * Then take a cold shower. * Then dose up on caffiene of your choice. But please don't do stuff like this often - if you're always working like that - then just go to bed.