Eating too much of any food at night can cause adverse reactions, including oysters. Oysters are nutritious. Each 100 grams of oysters contains 56 calories, of which 11% is protein and 1.5% is fat, and almost no carbohydrates. So the vast majority of the calories in oysters come from protein, making them a very protein-rich food. Oysters can provide an excellent source of protein for all ages, young and old. However, because oysters are rich in protein, which is more difficult to digest compared to carbohydrates and fats, eating too many at night can easily burden the gastrointestinal tract and cause indigestion and other symptoms. So it is not recommended to eat more, at the same time, oysters belong to the seafood, easier to allergy, allergic people should not eat.