Role of Sleep Reactivity in Shift Work Disorder

Inclusion Criteria:

* Participants must be working a fixed nightshift schedule, operationalized as: a) working at least three night shifts a week, b) shifts must begin between 18:00 and 02:00, and last between 8 to 12 hours, and c) must also plan to maintain the nightshift schedule for the duration of the study
* Participants must have Shift Work Disorder, which will be diagnosed based on ICSD-3 criteria
* Participants must show circadian misalignment, operationalized as a baseline melatonin onset between 18:00 and 01:00.
* Participants must be at least 18 years old

Exclusion Criteria:

* Insomnia disorder or excessive sleepiness predating the onset of shift work
* Termination of nightshift schedule
* Presence of other sleep disorders (e.g. obstructive sleep apnea, narcolepsy) determined by standard clinical polysomnography
* Diagnosis of bipolar disorder
* History of neurological disorders determined by self-report and medical history
* Pregnancy
* Alcohol use disorder
* Illicit drug use via self-report and urine drug screen if reasonable suspicion to test