So the "bed system".
You go to sleep at night, and gain energy while you are actually in the bed. However, the premise is that you are busy during the day and can't code. So you wake up, go to work, etc and lose energy while you do that. Then you are finally free for the day an can go code. So the challenge is that you have to time your sleep so that you get coding done, but also have enough energy to get through your work day and still have some left over to code.
It's not supposed to be fair, tbh. It was meant as a representation of how hard it is to participate in a game jam when you are busy and only have a few hours a day to code things. The theme for the game jam I made it for was "meta".
I do think some day it would be fun to use the coding mechanic from this game in something more arcade-like and more fun.