Shift work is an employment practice designed to make use of the 24 hours of the clock, rather than a standard 8 hour working day.

Shiftwork
Shiftwork
Rotating shift work schedules that disrupt sleep are improved by applying circadian principles.
Is there an association between shift work and having a metabolic syndrome? Results from a population based study of 27 485 people
Carcinogenicity of shift-work, painting, and fire-fighting.
Night-shift work and risk of colorectal cancer in the nurses' health study.
Shift work, risk factors and cardiovascular disease.
Shift work and chronic disease: the epidemiological evidence
Shift work and occupational medicine: an overview.
Biological clocks and shift work: circadian dysregulation and potential long-term effects.