Sleep is linked to your heart's health. Sleeping disorders like insomnia and sleep apnea, can lead to risk factors for heart disease. People with sleep apnea are more likely to die from a heart attack while sleeping than a person without the condition. People who unintentionally nod off during the day are more at risk of stroke. People who sleep less than five hours a night are more likely to develop hypertension than people who get a regular eight hours. Lack of sleep increases the risk of high blood pressure, hypertension, obseity and diabetes - all conditions associated with heart disease.