Can lack of sleep cause muscle spasms, around the heart? Im confused...?

No matter what. You need a good 8 to 10 hours of sleep. Try to go to bed at the same time and wake up from your sleep at the same time. It is important that you get adequatley sleep. Yes, I am a heart patient. And I know from my own experience, that If I do not take a nap in the afternoon, and go all day without one, my heart squeezes and feels like I am having heart pain ... Try to have a healthy sleep time and also a healthy diet.