Clinical Research Directory

Inclusion Criteria: * Adults scheduled for cardiac surgery; * ≥18 years of age; * Capable of giving informed consent; * Own a smartphone (Apple devices only). Exclusion Criteria: * Taking sleep aids (antihistamines, melatonin, etc.) * History of alcohol abuse (more than 2 drinks a day with last drink within the past 3 days) * History of substance abuse at risk of postoperative withdrawal; * Active diagnosis of alcohol or substance abuse; * Recent travel across more than two (2) time zones (within the past month); * Planned travel across more than two (2) time zones during the planned study activities; * Subjects, who have received an experimental drug, used an experimental medical device within 30 days prior to screening, or who gave a blood donation of ≥ one pint within 8 weeks prior to screening; * Subjects without access to WiFi in their or close to home or at work; * Patients with hearing aids; * Heart transplant patients; * Patients in isolation.