A new research has revealed that people, who are exposed to prolonged shortened sleep, have a significant increase in blood pressure during nighttime hours.The study led by Mayo Clinic researchers examined healthy and normal weight people who had prolonged shortened sleep and observed that during the nighttime, people with restrictive sleep systolic (top number) and diastolic (bottom number) blood pressure averaged 115/64 millimeters of mercury (mm Hg) compared to the normal sleep phase.The study added that the expected fall in blood pressure during the night was suppressed when people had inadequate sleep, and nighttime heart rate was higher with sleep restriction than in normal sleep.Naima Covassin, lead author, said that high blood pressure, particularly during the night, is one of the major risk factors for heart disease, and as per some studies Americans usually didn’t get enough sleep.