Literature Search Method
Resources: Four databases were consulted during this search – PubMed, the National Criminal Justice Reference Service, Defense Technical Information Center, and Google/Google Scholar.
Key Concepts: The following terms were used in varying combinations to discover appropriate citations.
For police concept: Police; Police Officers; Policemen; Law Enforcement; Law Enforcement Officers; Officers; Cops; Public Safety Workers; First Responders [excluding firefighters, emergency medical technicians, and paramedics].
For occupational exposure concept: Occupational Exposure; Occupational Disease; Occupational Accidents; Disorders of Environmental Origin; Occupational Medicine; Occupational Safety; Employment; Job.
For sleep disorders concept: Sleep Disorders; Dyssomnias; Intrinsic Sleep Disorders; Circadian Rhythm Sleep Disorders; Restless Leg Syndrome; Disorders of Excessive Somnolence; Idiopathic Hypersomnolence; Kleine-Levin Syndrome; Narcolepsy; Cataplexy; Nocturnal Myoclonus Syndrome; Parasomnias; Central Sleep Apnea; Obstructive Sleep Apnea; Obesity Hypoventilation Syndrome; Sleep Initiation and Maintenance Disorder; Sleep Paralysis; Sleep Arousal Disorders; Night Terrors; Somnambulism; Sleep Bruxism; Bruxism; Sleep-Wake Transition Disorders; Insomnia; Sleep Apnea; Jet Lag; Work Schedule Tolerance; Shift Work Disorder.