How is the Shanghai Pudong airport for sleeping? (will they kick you out?)?

I have a late arriving flight and the metro inconveniently stops running at 9- ridiculous!- taxis to where i need to go are super pricey so i was thinking of crashing in the airport for a few hours. has anyone slept in this airport? will the security kick you out if you dont have a departing flight- i only have an arriving so will they have a problem with me sleeping there vs someone leaving the next morning? advice?