Heart disease does not announce its presence with any sweeping declarations and is very often diagnosed only during routine checks. In fact many young people these days suffer from a silent heart attack that has absolutely no prior symptoms. Although there is no specific way to be free from the fear of developing heart disease there is substantial evidence that it could be more common in individuals who sleep for fewer hours. When you're sleep deprived your nervous system activity increases. This increases the heart rate and constriction of blood vessels. It also causes the body to retain more salts.