I'm looking at a Business Class flight with China Eastern Airlines

but the layover at KMG is 10 hours from 9pm to 7am the following morning. I know China Eastern has a lounge in the international terminal, but its hours of operation are 8am-5pm, which is useless for my layover. Does China Easter Airlines have a First/Business Class lounge I can access from 9pm to 7am? If not, is there a third-party lounge that can accommodate those hours? I don't want to be stuck at the airport for 10 hours without a place to rest. Thank you in advance!