5 hours sleeping at the Beijing Airport, possible?

My flight from Manila to BJ arrives at 00:30 am, i plan to have a 5 hours sleep at the airport before going to Mutianyu Great Wall at 7. Can i just sleep at some arrival seats there? because hourly lounge or Transit Hotel would cost a lot. Anybody here has experience sleeping here? I don't mind uncomfort cause i could sleep at anytime anywhere hehe.