Whether or not overnight lobsters can still be eaten depends on whether or not they appear to be spoiled. If the overnight lobster has an odor, it cannot be eaten again. If it is kept sealed and not spoiled, it can be eaten again.
If the crayfish cooked, stored at room temperature, placed overnight after the odor, spoilage and other conditions, then you can not eat, because at this time the taste has changed, and also easy to breed bacteria, easy to consume abdominal pain, diarrhea and other discomforts.
If the crayfish is properly preserved, such as sealed in the refrigerator, after a night, the crayfish did not appear spoilage, odor, you can usually continue to eat. However, it is recommended that daily life after cooking crayfish eat as soon as possible, because lobster left overnight, even if not spoiled, the taste and nutrition will also be reduced.
In short, if the overnight lobster has not deteriorated, it can still be eaten; if it has deteriorated, it can not be eaten. People who are allergic to crayfish should not eat crayfish.