my son scratches his head seriously when sleep since four months ago, I catch that two times at night-time. and quite often in day time like a habit, but in day time he is not scratches that hard. There are several blood shed on his head. I spot check his head few time in different weeks, one spot is wet blood fluid. I saw family doctor three times, but he has nothing to do. just told me if he stop scrratch his head, it will be okay. Is there any solution recommend?