Husband Has Feelings Of Tiredness And His Pulse Is Usually

husband has feelings of tiredness and his pulse is usually less tha 60. Echo cardiogram was done, normal.Stress test normal. His feeling of slow speech when interacting in a serious conversation,more sleepy tan normal. His blood pressure is within limits, oxygen measures above 90. Sleep study showeda diagnosis of obstructive sleep apnea(327.23),mild overall, severe in the supine sleep position. He quit smoking 9 years ago..but still chew some nicotine gum. Thank for your help. He takes lisinopril and atorvastatin, plus Vitamin D supplement.