CHICAGO --It seems a little extra sleep is good for the heart.Researchers at the University of Chicago Medical Center say one extra hour of sleep each night appears to decrease the risk of coronary artery calcification, which is associated with heart disease.
They say 27 percent of a study group with calcified arteries slept less than five hours a night. The number dropped to 11 percent for those who slept five to seven hours and six percent for those who got even more shut-eye.
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