I am likely to put in something to keep them a bit refreshed during the day. In testing, when we overdid this they would not sit still even for a moment at night. It IS a challenge to balance.

One thing to keep in mind, though: if you are like me and train at least one to be a work-a-holic, that one will be exhausted often. Frequent naps help. That's working as intended and is just like real life, isn't it...