He should have a cardiologist look at his EKG, not because of the bradycardia, because that is very common in athletes, but because of the repolarization abnormality. Most of the time this is a benign finding, however, there are very rare cases where it might need to be worked up further. I don't think that your sons bradycardia is causing him to sleep poorly. HR of 49 is a normal finding in the setting of sinus rhythm. I would not worry about his ventricular rate at all. Sinus arrhythmia is a sign of a healthy heart.