Arriving and departure in Aiport- 12am

Hi,

Can I ask a few questions:

1) Until what time are the shops/restaurant open till? Since I am arriving at 12am and departure around 1am as well.

2) There are 4 adults. Is it ok if we just book 1 room in Dazhong Airport Hotel (as we just need a place to lie down for 8 hours). Not sure if they will shoo us away?