Guangzhou Baiyun Airport overnight

My daughter and friends are attending summer camp in July and are arriving in airport approximately 1 am. The camp is unable to pick them up until about 8. Where is a good place from them to stay in the airport? It looks like the lounges don't open until 6 or 6:30, and I see conflicting reports on restaurants that are open 24 hr - Any advice is appreciated - Really all then need is area to sit and wait and use their phones.