<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, may I answer your health queries right now ? Please type your query here...At 4 in the morning I woke to a headache and my heart beating at 100minute. 15 minutes later it is at 85minute. Took some asprin for the head. Why is it beating so fast? Had the EKG, angiogram, etc. Showed everything ok Under much stess lately.  <response>: Hello! Welcome and thank you for asking on Chat Doctor! Your symptoms could be related to a sleep disorder nightmares, probably related to the increased stress which you have been going through. Anyway, if the problem persists, I would recommend consulting with your doctor for a physical exam and some tests: - an ambulatory 24-48 hours ECG monitoring to examine your heart rhythm trends through a longer period and exclude possible arrhythmia- complete blood count for anemia-thyroid hormone levels for thyroid dysfunction- blood electrolytes for possible imbalance. If all the above tests result normal, you should consider anxiety as the main cause of your troubles. In such situation Yoga and meditation would help improve your situation. I would also advise you to avoid caffeine intake. Hope to have been helpful! Wishing all the best, 