A slow heartbeat and dizziness around 8:00 p.m. every night may be caused by myocardial ischemia, but it may also be caused by anemia, sick sinus node syndrome and other conditions. 1. Myocardial ischemia: patients due to myocardial ischemia, will lead to a slow heartbeat, there is not enough blood transmission to the brain, there is insufficient blood supply to the brain, which in turn triggers the symptoms of dizziness. If necessary, you can take aspirin, clopidogrel and other drugs under the guidance of the doctor for treatment. 2. Anemia: patients with anemia may also experience symptoms of slow heartbeat and dizziness at certain moments. If the symptoms are not serious, you can eat animal offal and protein to relieve them. If the symptoms are more serious, you can take iron supplements under the guidance of a doctor. 3. Sick Sinus Node Syndrome: Sick Sinus Node Syndrome is a condition in which the sinus node pacing or conduction function is impaired, causing arrhythmia. Mild cases can be treated with medication, while severe cases may require pacemaker implantation. It should be noted that the patient’s heartbeat slows down around 8 o’clock every day, dizziness may also be caused by other diseases, it is recommended to go to the hospital in a timely manner to find out the cause of the symptomatic treatment.