Hours of work and sleep were recorded in daily activity logs by 46 enlisted men on two Fleet Ballistic Missile submarines during routine patrols. Total working time (watch standing, non-watch work, and study) averaged 12.0 hours a day. Daily sleep time averaged 8 hours a day on the ship and 7.5 on the other. Sleep was mildly fragmented in that the men averaged 1.3 sleep episodes, of somewhat less than 6 hours duration, in 24 hours. Thirty of the men were standing watch on a 6-hours-on-12-hours-off rotation which effectively imposed an 18-hour cycle on their activities. Questions in the logs were used to assess subjective sleep quality and sleepiness. Sleep quality on patrol was not as good as in a post-patrol period, but the difference between on- and off-patrol sleep quality was small. The 6-on-12-off watch schedule appeared to result in less sleep fragmentation than the traditional 4-on-8-off schedule. (Author)
Work and Rest on Nuclear Submarines
1981
28 pages
Report
Keine Angabe
Englisch
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