I considered myself reasonably healthy for a 67 years old female. always energetic, but this past few days, I found myself yawning even if I had a good sleep. My hemoglobin and hematocrit is normal , so I ruled out anemia. I measured my blood pressure and diastolic is on the low side 60, 62, systolic 128-130.My pulse rate is 48-52 which normal for taking Metoprolol, beta blocker. Could it be the reason why I am yawning , the resting period of my heart is not normal.... not enough oxygen reaching my brain? I know that when I exercise I will be oxygenated... but I want to have a normal diastolic. Thank you for helping me .