Can Gao Fen Hongqiao Airport Terminal 2 stay overnight for 24 hours?

I am now in the departure hall on the third floor of T2 Hongqiao Airport. Anyone who wants to clear the scene from the "arrival hall" on the first floor until 1 am has to spend the night in the departure hall on the third floor. There are many plugs on the third floor to play with laptops, and the air conditioner is on. There is also a free hot spot at the airport, which seems to be searched after 2 am, so I have to play with the WIFI account of Telecom. If you want to have a rest, you can sit or lie down in the waiting room on the third floor, depending on whether you have a seat. There is also a red sofa in front of China Mobile VIP Club, where you can sit. Although it is surrounded by a rope that says "Guan", you can ignore it. As for Mike or Ken, there seems to be no one on the third floor except a Starbucks that is open all night. Their homes are all bar stools without backrests, which makes them uncomfortable to sit on.