Programming ability might have to be more subjective, but we've also built a Ballmer Calculator based off well established formulas.
Basically, you put in your weight and sex, we tell you how much you 'should' drink to get to the Ballmer Peak.
Also, I am a bit of an obsessive 'pre-thinker' so it helps get over that hump and get me coding.
Strangely, I wake up more refreshed after those nights than when I 'just want to get through one more TODO'.
Remember: Lots of checkpoint commits to your local repo...you'll probably have to trash the last couple. and you should avoid committing to the master until you've had a chance to clean up in the morning. Alarms are good for this.
That might be a good time to use a BAC calculator and post your findings...one 'measurement' per commit and judge the code later. If you do this, please post a graph. I would be interested in seeing this data.
And may your Ballmer peak become a Ballmer plateau!