Yeah if you're in one of those final destination movies and the concession stand falls on you or something. A concussion, yes. Not allowed to sleep with one of those...I gave myself a concussion once, it was awful.
Doctor's are taking concussions very seriously because they can lead to brain damage. You need to be checked out to see that there isn't something more wrong that a hard bump to the outside of your head. The bones inside your skull have very sharp edges.