Sleep deprivation is known to cause, among other things, poor judgement and code that the unfortunate reviewer - OK me - was going to have to deal with.
“Hey, I pulled an all-nighter and it works.”
-inward groan
"Against the test suite?"
"Well, I didn’t have time for that."
That, and 2a.m. emails from the CEO demanding that we do something really, really stupid because the customer was shouting about it at midnight.