I don't have a strict schedule for my toddlers, just fill their needs as I go, but they NEVER get a full night sleep because even if I feed them before going to bed, they'll still be in the red for hu...
I rarely pay attention to the clock in the game, and have pretty much reverted to how I played the Sims2 (where I started). I do, however, keep watch on my Sims' needs, particularly the toddlers. Get them potty trained, and they will see to their own needs, pretty much. I also make sure a Sim serves whatever meal it is so that the toddler can help themselves. Yes, I've had cranky, hangry toddlers, but I just have their parents deal with it. LOL