FOR RELEASE SATURDAY, FEBRUARY 4, 2017, AT 12:01 A.M. CST.- This photo taken Dec. 28, 2016, shows data during a sleep study at Mercy Medical Center-Dubuque’s sleep lab in Dubuque, Iowa. Over the past 15 years, sleep has become widely recognized as a critical aspect of good health, and new research has shed more light on its importance in cardiovascular, metabolic and immune health.