My 5 month old grandson is taking .07 mg of Propranolol 3 times a day for a slow heart beat. Lately he has not been sleeping well-I've noticed after his medicine dose at 11:30pm that he is wide awake til 2:00 - 2:30a.m. Could this be caused by his medicine. I didnt notice this as much when he was only taking .02 mg.

Thank you!

Karen