Further, I'd say most of the evidence indicates this. A sampling of it follows. We know regular sleep improves quality of life and thinking. We also know many people who don't have it think that's not true but prove otherwise in tests. ;) Quiet office vs cubicle research long ago showed being able to focus with minimal interruptions improved productivity. A person with friends and family trying to code nonstop will be closer to cubicle vs someone who does it less but allocates time to not be bothered. Finally, there's also data from experiments like Fagan's Inspection Process, Mill's Cleanroom, and Altran/Praxis' Correct-by-Construction that teams of smart people on regular schedule using the right methods and tools produce the highest quality software you can get.

So, evidence is vastly in favor of a more moderate approach to developing software in one's free time. Even for a person who practically lives on a computer. The brain needs novel experiences and breaks from things. Just works better that way as connecting new dots is the basis for creativity. Gotta feed it more dots. :)