The Kringla and Pâtisserie in Epcot don't open until 11AM so you'd have to get their yummy pastries the night before and I think they close when IllumiNations begins. Last fall on EMH night Kringla stayed open until the end, but the Pâtisserie closed a little earlier.
Starring Rolls at DHS closes early - someplace around 3 or 4.
I think Main Street Bakery in the MK is open as long as the stores on Main Street.
No idea about Kusafari Bakery in AK.
We've had pastries from the Epcot bakeries for breakfast the next morning and they were delicious.