Possibilities to rent a room/spent time in lounge during 10 hours layover in Capital airport

We are landing at Beijing airport terminal 3 in the morning 25th Dec after flying from Sweden, we will have a 10 hrs layover and are wondering if there might be a hotel or lounge to get a couple of hrs of good solid sleep.

If there is such a place at T3, what does it cost and where might we find it?
And how does one go about the booking (if it is possible)?

Lot of questions, very thankful for answers.

Sincierly

Richard