Accession Number : ADA294159

Title :   Sleep Patterns in Air Traffic Controllers Working Rapidly Rotating Shifts: A Field Study.

Descriptive Note : Final rept.,

Corporate Author : FEDERAL AVIATION ADMINISTRATION WASHINGTON DC OFFICE OF AVIATION MEDICINE

Personal Author(s) : Cruz, Crystal E. ; Della Rocco, Pamela S.

PDF Url : ADA294159

Report Date : APR 1995

Pagination or Media Count : 18

Abstract : This study was part of a research program in shift work and fatigue in the Air Traffic Control (ATC) environment. The purpose of the study was to investigate three different shift schedules in use at ATC facilities with respect to potential disruption of the sleep/wake cycle. A straight day schedule of early morning shifts (i.e., beginning before 0800), and two variations of counterclockwise, rapidly rotating shift schedules, the 2-2-1 and 2-1-2, were analyzed in terms of total sleep time, asleep and awake times, and subjective ratings of sleep quality and sleepiness. Data were collected in daily logbooks by air traffic control specialists (ATCSs) Total sleep time on the 2-2-1 schedule showed a characteristic decline from approximately 8 hours before the two afternoon shifts, to 5 hours before the two early morning shifts, to 2.4 hours before the midnight shift. Total sleep time on the 2-1-2 schedule decreased from 7.5-8 hours before the two afternoon shifts and one midday shifts to approximately 6 hours before the two early morning shifts. Total sleep time on the straight day shift schedule was approximately 6 hours for each day of the week. The least amount of sleep was obtained before early morning shifts in all of the schedules and before the midnight shift in the 2-2-1 schedule. Disruptions in the timing of sleep were limited to changes in the timing of waking up associated with rotations into the early morning shifts for the 2-2-1 and 2-1-2 schedules and, of course, the afternoon sleep before the midnight shift. Neither subjective ratings of sleep quality or sleepiness were found to vary by schedule type. More high ratings of sleepiness on the drive home, however, were reported following the midnight shift than any other shift.

Descriptors :   *AIR TRAFFIC CONTROL SYSTEMS, *EXPOSURE(PHYSIOLOGY), *SLEEP, CYCLES, TIME, QUALITY, SCHEDULING, SHIFTING, WAKE, PATTERNS, DAY, DRIVES, RATINGS, ROTATION, AIR TRAFFIC CONTROLLERS.

Subject Categories : Psychology
      Stress Physiology
      Personnel Management and Labor Relations

Distribution Statement : APPROVED FOR PUBLIC RELEASE