Linked from
The 11 pages that link to Shift work, each with the reason it gives.
ChronotypeRelated: A worker's chronotype can affect adaptation to night or rotating schedules.
WakefulnessRelated: It can require wakefulness when circadian signals favor sleep.
Workweek and weekendCompared with: Rotating or overnight shifts can make weekends ordinary workdays.
MorningRelated: Shift schedules can move waking and work away from the usual morning.