Effects of Blocking Blue Light at Night Post CABG, AVR, MVR, CABG AVR, CABG MVR, or SAH

Inclusion Criteria: * Both men and women that are undergoing elective (non-emergency) * on-pump CABG surgery, * AVR, * MVR, * CABG AVR, * CABG MVR or * SAH * No history of diagnosed psychiatric disorders or organ failure Exclusion Criteria: * Evidence or diagnosis of dementia or other cognitive deficit * Diagnosed psychiatric disorder (including depression and anxiety) * Organ failure \[kidney (creatine \> 1.5 mg/dL), liver, etc.\] * Chronic obstructive pulmonary disease, * Any immune disorder * Acute infection * Prior cardiac surgery * Elective aneurysms * Combined cardiac operations * Left main stenosis greater than 70% * Left ventricular ejection fraction (LVEF) lower than 0.5 * Any condition that increases likelihood of the need for a blood transfusion during or after the surgery * Clotting disorder * Suspected less than 8th grade English reading comprehension level