If you want to meet Anna and Elsa, ride the 7 Dwarfs Mine Train, or are picky about what time you get to ride Toy Story Mania, then absolutely you want to stay up until midnight. Also, you will be going while Soarin is down, so that will make Test Track FP+ much harder to get as well. That may very well also be one that must be grabbed at midnight or it is gone until Soarin is back up and running. Outside of that, you should be fine in the morning. If you are looking for parades or fireworks type shows (Wishes, Illuminations, Fantasmic), sometimes those are gone by morning as well (but sometimes they aren't even in the system at 60 days out, so who knows).