Apparently, there are certain times of day that favor heart attacks. Researchers have noticed a definite pattern in the times when heart attacks occur.
Heart attacks are least common at night.
Morning heart attacks tend to be the kind in which the heart can't be shocked back to normal. Doctors believe it's not so much the time of day that affects the heart, but the activities usually carried out at these times of day. Stress, environment and activity appear to trigger heart attacks. Doctors at UT Southwestern Medical Center at Dallas warn that these are just patterns. Heart attacks can happen at any time.