This apparently exists on the Federal level in the U.S.: https://www.opm.gov/policy-data-oversight/pay-leave/pay-administration/fact-sheets/night-shift-differe

This apparently exists on the Federal level in the U.S.: https://www.opm.gov/policy-data-oversight/pay-leave/pay-administration/fact-sheets/night-shift-differential-for-federal-wage-system-employees/ https://www.opm.gov/policy-data-oversight/pay-leave/pay-admi... Though it sounds like on the Federal level, the employee must work a majority of their hours within a particular time period to qualify: Night shift differential means the differential paid for work performed when the majority of a prevailing rate employee's regularly scheduled nonovertime hours fall between 3 p.m. and 8 a.m. It is computed as a percentage of the employee's rate of basic pay.