Personally, I think it is profitable to set up a stall in the middle of the night to make fried rice noodles. But it still depends on your own skills in frying rice noodles and the location of the booth. If you find a good location, plus your fried rice noodles are delicious and the food is hygienic, I believe there will be many repeat customers, business will be booming and you will make a lot of money.