[Tutor] OT: Writing code while tired, counterproductive?

[Modulok]

List,

This is kind off topic, but:

Does anyone else find, writing code while tired to be counterproductive?

It just seems like when I push myself to stay up late finishing a
project, I sorely regret it the following day. Granted, Python is a
fairly forgiving language and doesn't take the mental attention that
some others require (like C++ ...or someone else's C++ ....or someone
else's poorly written C++), but for me, writing code while tired
usually ends up being a bad thing - In any language. But then there's
the guilt of taking the day off and not meeting deadlines. *grumble*
Just wondering if this is a common occurrence among the masses.

Anyone?
-Modulok-