Swapping battery packs would make more sense than shutting down the robots at night to charge. Ignoring that, it isn't sensible to use robots that are about as efficient as Homer Simpson:
That day Riley was running fiber-optic wiring through a new building, and the work was going more slowly than he could ever remember. His fellow laborers were more apt to take breaks and bullshit, not taking their foreman’s warnings seriously.
And obviously our daily routines are necessary, but we still obtain pleasure from them. Eating and sleeping are enjoyable and satisfying.