Unless this has very recently changed, you can add one side order of bacon or sausage to your breakfast without having to pay extra, if you are in a sleeper. I've never been with anyone who tried to add more than one side order to it, so I don't know if they'd allow that or not.
Alcoholic beverages are not included in the "free" meals for sleepers. Desserts are included, however. (Unless there have been recent policy changes.)
Enjoy your trip if you've not already completed it! In my experience, the crews on the Crescent are usually cheerful and polite.