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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.I am sorry for his symptoms.I would advise to take him to ER.Head injury symptoms can manifest later as in case of subdural hematoma.There can be other causes like sleeping disturbances, an infection, dehydration, electrolyte imbalances etc.However, an examination in person & a few tests would be needed.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish her healthy life.Regards.