Answer:
Variant angina also called Prinzmetal's, or Vasospastic. It is a syndrome typically consisting of angina (cardiac chest pain) in contrast to stable angina which is mainly triggered by exertion or intense exercise, commonly happens in people at rest or even asleep and is caused by vasospasm, a narrowing of the coronary arteries caused by contraction of the heart's smooth muscle tissue in the vessel walls. In comparison, stable angina is due to the permanent occlusion of these vessels by atherosclerosis (i.e. buildup of fatty plaque and hardening of the arteries).
Step-by-step explanation:
I had to learn about this because someone in my family had it.