Hi Deborah!
Thank you for visiting the Moms Panel!
In my experience, the quick-service Restaurants at the Walt Disney World Resort hotels will be open before the table service restaurants, but even the quick-service restaurants may not be open until 6.00-6.30 am.
If you wish to check all the Walt Disney World Resort restaurants for their earliest reservations on your preferred dates, the
online reservation system may help you. Without specifying a particular restaurant, just select your preferred date and time (on the right-side of the screen). This will enable the system to search the whole resort for your early choice of reservation.
Alternatively, you may choose to buy some snacks (from your resort gift shop) to keep in your room, to ensure you can enjoy your breakfast as early as possible.
If you have any other questions, please come back and ask me - I would be happy to help you plan your magical vacation!