So you've just pulled an all nighter, how do you get through the day?
waivej: I've done quite a few, and remember fondly a double all nighter my first startup pulled to release 1.0.  Sometimes it makes sense, but it is better to be avoided.-Feed yourself well.  Avoid sugar.  Drink water.  
-Marvel at the sun, people in their rituals, etc.
-Make a simple agenda: when to leave work, when to eat, etc.
-Take a nice shower, dress comfortably.
-Put on music and get into a groove.
-Don't make any critical decisions.  
-Defer tough conversations.
-Plan "re-entry" with enough sleep to land on a normal schedule.  (ex: 12 hours of sleep ending at 7:00am.)