Inclusion Criteria:  Participants must work at least 2 night shifts a week Participants must have night shifts starting between 18:00 and 02:00 and lasting 8 to 12 hours Participants must have maintained this night shift schedule for at least 6 months Participants must have Shift Work Disorder, diagnosed based on ICSD-3 criteria  Exclusion Criteria:  Medical history of central nervous system disorders Medical history of other sleep disorders Diagnosis of an unstable major medical condition medical chart review Dependence on alcohol (≥ 4 beverages a day) Heavy tobacco use (≥ 10 cigarettes per day) Recreational drug use Use of medications impacting central nervous system functioning Caffeine use in excess of 5-6 servings (~ 600mg) per day Pregnancy