Accidents, Occupational--prevention & control Accidents, Traffic--prevention & control Adult Aged Persons with Disabilities--statistics & numerical data Female Firefighters--statistics & numerical data Health Education--methods Health Promotion--methods Humans Male Middle Aged Occupational Health Prospective Studies Referral and Consultation Self Report Sleep Deprivation--prevention & control Sleep Medicine Specialty--methods Sleep Stages--physiology Sleep Wake Disorders--diagnosis Surveys and Questionnaires United States Workplace Young Adult