Can I sleep at the Capital Airport for one night? . . Is it cold at night?

Cold is definitely cold, compared with the south. . Look at the weather before you leave (pay attention to whether there is smog). All airports can stay overnight. If it is not too late, it is recommended to go to the surrounding chain hotels (go to the Fourth Ring Road and book the hotel in advance). If the price is not high, there will be meat buns when you go out.

If you are not familiar with the place, you can visit mobile navigation. If you don't know, you can ask your aunt. Freer people will answer with emotion (at least in the second ring)

Recommend mobile phone software, navigate "Gaode", hotels "Meitu, Ctrip, where to go", and find "Meituan" if you are not used to it.

It is recommended not to fly too late. Although the fare is low, the fare is not proportional to the comfort.