The overnight eggs kept in the refrigerator and not spoiled can be eaten, but the spoiled overnight eggs can not be eaten. Eggs are rich in nutritional value of food. 100 grams of eggs contain 143 calories, of which 0.72 grams of carbohydrates, 12.56 grams of protein, 9.51 grams of fat, and rich in vitamin A, calcium, iron and other nutrients. Eggs are rich in nutrients, but they are also very easy to spoil when kept at room temperature, and will release more hydrogen sulfide, phosphine, amines and other harmful substances after spoilage, which can easily lead to food poisoning after intake. Cooked eggs can only be kept at room temperature for three to four hours, and the storage time may be further shortened as the room temperature increases. However, they can be kept in the fresh layer of the refrigerator for three to four days and in the freezer for three months or more. Regardless, it is recommended that any food be consumed as soon as possible after purchase and not left out for too long to ensure food safety.