Cool concept which I can relate to, but going to sleep was really strange in the game. Once I would not be able to continue playing until my energy bar went back down to where it was originally. It kind of defeated the purpose of balancing work and sleep.
You don't have control during the day because you're off at your day job and such. The premise is more than just balancing coding and sleep. It's also balancing your day job, and house work, and spending time with your family, and all that. The idea is that you're so busy through the day that the only time you have available to code is late at night. 11pm (23:00) is when you're finally free to work on your own things.