Lack of sleep is more serious than just being tired. Sleep loss has been linked to increased rates of depression, weight gain, hypertension and cardiovascular problems. It can make fighting infection tougher and can even lead to type 2 diabetes. The Sleep Medicine Clinic and Sleep Center at University of Minnesota Medical Center, Fairview — accredited by the American Academy of Sleep Medicine and Joint Commission on Accreditation of Healthcare Organizations — aim to help those deprived of much-needed sleep and improve their quality of life.