Hi Megan and welcome to the Disney Parks Moms Panel!
You can have an overnight guest in your Walt Disney World Resort Hotel while on vacation as long as you don't exceed the room occupancy limits. There is also a fee for more than two adults in all of the resorts except the Deluxe Villa Resorts,
The Cabins at Disney's Fort Wilderness Resort, and the Family Suites at
Disney's All-Star Music Resort or
Disney's Art of Animation Resort.
The extra fees are as follows:
Value Resorts $15.00 per additional adult per night
Moderate Resorts $25.00 per additional adult per night
Deluxe Resorts $35.00 per additional adult per night
If you need to add someone to your reservation, even if it's just for one night, call (407) 939-1936 or stop by the front desk of your Resort Hotel.
Megan, thank you for visiting us with your question. I hope you'll let us know if we can help you with any other planning questions.
Wishing you a magical vacation,
Amy H