Just go to Qatar airways desk after you arrive and tell 'em you need a hotel . Since your transit time is more than eight hours you'll be able to get one . & that'd be the ORYX ROTANA. It's Qatar airlines' hotel .

Once you get it go thru the immigration and there will be a hotel shuttle outside . If you're confused , call anyone in Nepali coz there are tons of them working at the airport.

Hope this helps . GOOD LUCK