can I stay night at the Zhengzhou airport ?

hi , I'm Japanese going back to Japan from Thailand via Xinzheng International Airport.
I will arrive at Xinzheng International Airport at 1:15 am and my next flight is 8:00 am. I have about 7 hours. Is the airport open for 24 hours? I don't have visa and hopefully l can stay night there waiting for next one.

if it's not open for 24 hours, where should I be?

it's about 3 days later, so I would be happy if you response soon.