“Fixed schedules consist of working hours and working days that are the same from week to week. This type of schedule can allow the employee’s body to adjust to a different circadian cycle” (Oexman, Knotts, & Koch, 2002, p. 152).
Oexman, R.D., Knotts, T.L., & Koch, J. (2002, December). Working while the world sleeps: A consideration of sleep and shift work design. Employee Responsibilities and Rights Journal, 14(4), 145 - 157.