SCOTTSDALE, Ariz. — Editor's note: The First at 4 team taste tests White Castle burgers in the video above.
You can head to White Castle for a sweet, sweet 3 a.m. hamburger starting on Sunday.
The restaurant will be open for business 24 hours a day starting January 12.
Arizona's only White Castle opened in October to huge crowds. Some people waited as many as 6 hours for a slider on the first day.
White Castle has since been operating on limited hours to restock and reset.
The dining room will continue to close from 3 a.m. to 6 a.m., but the drive-thru will be open 24/7.