The most dangerous complications after a head injury
are epidural or subdural hematomas. As your doctor said not to worry since you had no vomiting
, giddiness or loss of consciousness
in the initial 48 hours, I too think that these complications can be excluded. But, as you are complaining of excessive sleep and concentration lapses, it is better to undergo complete neurological examination under the guidance of a Neurophysician to rule out any other possibilities related or unrelated to the head injury.