Deadlifts

It usually goes one of two ways. Either something happened during a set and you knew about it immediately, or nothing happened at all and you woke up the next morning barely able to get out of bed. The second version confuses people more, because there was no moment to point at. You lifted what you always lift, the session felt fine, and now you can hardly tie your shoes. Either way the question is the same. What actually went wrong, and can you keep lifting.