Mark,
Thank you for your question!
You be glad to hear that
yes, you are allowed to enter, exit, and re-enter your reserved theme park on a given day!
My family does exactly the same thing. We need that afternoon break to keep us energized for the rest of the day. A little down time, either exploring our resort hotel grounds, swimming, or sometimes even just grabbing a quick nap, helps everyone avoid burning out before we make it to dinner. The afternoon break is an essential ingredient to a great Walt Disney World vacation.
Remember as your vacation approaches to keep watching for updates at the
Disney Parks Blog. I find that their posts, like
this one about the new Disney Park Pass system, to be particularly helpful. Of course you really should also write us back at the Disney Parks Moms Panel to ask more questions about what special activities they may have at your given resort to make those afternoons even more fun.
Have a Magical Vacation!
Doug