My four year old fell off the couch and hit her head on the floor, which is basically a concrete slab with linoleum over it. She cried and we could instantly feel a bump, but she continued to play the rest of the evening, ate a good dinner, and watched a movie with us. That was approximately at 3pm. Now it is midnight and checking on her, she has sweated through her pajamas and looks somewhat paler. There is no sign of vomiting, but I'm still concerned and wondering if I should take her to the ER.