Scrambled eggs can still be eaten overnight as long as they have not spoiled, but if they have spoiled, then they should not be eaten. Whether scrambled eggs can be eaten after overnight is related to the preservation environment of scrambled eggs, if they are preserved in higher temperatures, the bacteria multiply a lot making the scrambled eggs emit a sour odor, then they must not be eaten. In addition, because eggs contain a large number of proteins, which is a nitrogenous compound, under the decomposition of bacteria can produce nitrites, indoles, amines and other substances that are harmful to human health, partially carcinogenic, and therefore also should not be consumed. If the scrambled eggs are stored in a low-temperature environment refrigerated, due to the low-temperature environment is not conducive to the propagation of bacteria, refrigerated storage, scrambled eggs did not rot and deterioration, the production of nitrites and other substances are also less, it can be heated and then eaten. Overnight scrambled eggs if preserved better, although you can eat, but still is not recommended for consumption, it is recommended to eat more fresh ingredients made of food.