Is there a hotel in Beijing airport without leaving the airport?

We'll be arriving at Beijing airport on May 4, 2011 in the afternoon. We have an infant and need a place that can accommodate us comfortably without leaving the airport. We will not have Chinese visas, and cannot leave the airport. Is there a hotel at the airport? We'll be leaving to Ulaanbaatar the next morning. Can you please help us. Thank you.