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Who Works the Night Shift?
Surviving the Night
Sleep
Talk About It

Information courtesy of Circadian Technologies, Inc.

Backward rotation
See
counterclockwise shift rotation.

Clockwise shift rotation
A work schedule in which shifts move forward, from days to evenings to nights. See
rotating shifts; compare counterclockwise shift rotation.

Compressed workweek
A schedule in which employees work approximately 40 hours in fewer than 5 days, often in 10- or 12-hour shifts.

Continuous operations
A situation requiring around-the-clock manpower.

Counterclockwise shift rotation
A work schedule in which the shifts move backward, from nights to evenings to days. See
rotating shifts; compare clockwise shift rotation.

Day shift
A period of work in which half or more of the hours worked are between 8 a.m. and 4 p.m.

Double shift
Two consecutive shifts worked in one 24-hour period.

Evening shift
A period of work in which half or more of the hours worked are between 4 p.m. and midnight.

Extended duty hours
Long periods of work that cause a worker to get less sleep than usual or no sleep.

Fixed shifts
A work schedule in which the hours of work remain the same from day to day. Compare
rotating shifts, irregular shifts.

Flextime
A system in which starting and stopping hours of work are determined by the individual worker, with a required number of total hours specified by the employer. Usually there is a daily core period when all workers must be present.

Forward rotation
See
clockwise shift rotation.

Full-time employment
A job consisting of 35 or more hours of work per week.

Irregular shifts
A work schedule that is variable and erratic. Compare
fixed shifts, rotating shifts.

Moonlighting
Holding more than one job.

Night shift
A period of work in which half or more of the hours worked are between midnight and 8 a.m.

Nonstandard work schedule
See
shiftwork.

Overtime
Time worked at one job in excess of 40 hours per week. Overtime may be required or voluntary.

Rotating shifts
Work in which the hours from day to day or week to week change regularly, for example from a days to evenings to nights. Rotation may be rapid (e.g., 1-3 days), medium length (e.g., 1 week), or long (e.g., 4 weeks); it may proceed forward, as noted above, or backward (days to nights to evenings). Compare
fixed shifts, irregular shifts.

Shiftwork
Any nonstandard work schedule (including evening or night shifts, rotating shifts, split shifts, and extended duty hours) in which most of the hours worked are outside the period between 8 a.m. and 4 p.m. See
day shift, evening shift, night shift, rotating shifts, split shift, extended duty hours.

Shiftworker
A person who works a nonstandard schedule. See
shiftwork.

Shortened workweek
A schedule of full-time employment that comprises 35 or fewer hours of work per week. May also be used to mean compressed workweek.


Copyright 2000 Circadian Technologies, Inc. (Cambridge, Mass.), publishers of information for night workers and managers of 24-hour operations.


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