I'm going to have to say no on this idea. In fact, I think Rockstar has ironically poked fun at this element of RPG's before with the Men's Room in GTA IV. At 7:20, Jeremy talks about "Online-Me.com" where he can "build himself a character", "watch him go to the bathroom" and "sleep". And in all seriousness, I'd rather keep these elements out of the game, aside from mock activities, where they don't actually affect gameplay progress.
I think ideas like this are best left to PC mods, much like the "Gas Mod" for GTA IV and V.