It is possible to drink fresh lemonade overnight, but the nutritional value is not as high and it can be drunk purely as a beverage. Lemonade is chemically very stable and does not deteriorate overnight, so it can be drunk overnight. However, in reality, citric acid can produce some deposits if it reacts with air, which is especially bad for the stomach. Although there is no harm in overnight fresh lemonade, but if it is not sealed well, or the temperature is high, lemonade is easy to be contaminated by bacteria, which is likely to lead to diarrhea.