You can wake them up to have them use the Potty chair, and then send them back to bed. Also, same with food. I have three Toddlers in my game at the moment. The firstborn, and his younger twin sisters. But, I agree, it does seem most of the time they're sleeping. In my busy household, that can be a blessing! As for the tent, I only have one of those in this same household. One of the twins used to use that all of the time, but it doesn't grow their energy as well as the Toddler bed. So, there you have it.
ETA: I'm hoping that when Infants drop, one of the things EA will address is the lack of energy providing beds for the Tots. Perhaps, in a pack?