<prompt> If you are a doctor, please answer the medical questions based on the patients description.My son took a knee to his head during a pick up football game 11 years old. He did not lose consciousness, but came home and threw up. . .and has been sleeping for about 3 hours straight. Should I let him sleep? He was not confused. . .but just didn t feel good.  <response>: Hi, With the events you mentioned, Its unlikely for him to have any significant head injury. But still we need to be a bit cautious. If this is not his usual sleeping time, try to awaken him and talk to him- If he feels Chat Doctor. If he is feeling fine after waking up, no further vomiting or headache - nothing to worry. Hope I have answered your question. Let me know if I can assist you further. 