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Heart health is tied to how much sleep you get.  There is an optimal amount of sleep: 6-8 hours per night.

Those who slept less than 6 hours per night had twice the risk of heart attack or stroke compared to those who slept 6 to 8 hours per night.  Studies have linked insufficient sleep with

• hyperactivation of the sympathetic nervous system,
• glucose intolerance,
• an increase in cortisol,
• increase in blood pressure,
• decreased variability in heart rate,
• disruption of hypothalamic axis, and
• increase in inflammatory markers.                               Wow!  All bad things!

Those who slept more than 8 hours per night had a twofold increased risk of heart pain (angina) and an increased risk of coronary artery disease (which may lead to heart attack). It is postulated that patients who sleep more than 8 hours per night may do so because of an underlying condition like lung disease, diabetes, or low socioeconomic status which all could contribute to cardiovascular risk.

Hope this helps.