There are many snack stalls and restaurants in Yubei District of Chongqing. Here is some information that may be useful:

1. Hotpot: There are many hot pot restaurants in Yubei District, which are popular choices for supper. Among them, there are famous hotpot, Li Ji hotpot and Little Swan hotpot.

2. Noodles: There are many noodle restaurants in Yubei District, which are common choices for supper. Among them, the famous ones are wife noodles, glasses noodles and Hongyadong noodles.

3. Grilled fish: There are many grilled fish shops in Yubei District, which are popular choices for supper. Among them, there are some famous grilled fish along the river, Li Ji Chuanxiang grilled fish and Taotaoju grilled fish.

4. Maoxuewang: Maoxuewang is one of the traditional cuisines in Yubei District and a popular choice for supper. There are many Maoxuewang shops in Yubei District, among which the famous ones are Laotearoom Maoxuewang, Liji Chuanxiang Maoxuewang and Taotaoju Maoxuewang.

5. Snacks: There are many snack bars in Yubei District, which sell all kinds of traditional snacks, such as hot and sour powder, mala Tang, tofu, wonton and so on. Among them, Chen Mahua, Ciqikou Snack Street and Huangjueping Snack Street are famous.

In a word, there are many delicious midnight snacks in Yubei District. You can choose according to your own tastes and preferences.