Insomnia

The good thing about being up at 3am is that, with a laptop, you can keep yourself entertained by whipping up a quick spreadsheet of the rack, switch and console server layout for the new server room.

The bad thing is that you may not trip over Sun's handy-dandy power calculators (like for the X4140 or the X4440 until the next day, leaving you twelve hours to wonder blearily if you've blown your server room's power budget all in one go.