# At least one occurrence of sleep was detected among 45% of officers in the
6/6 team working the 0000-0600 hrs watch at Chalmers and one occurrence for
about 40% of those on the 0000-0400 watch in the 4/8 pattern.
# At Warsash, where the watchkeepers remained undisturbed in their off-watch
rest periods, the number of occurrences of sleeping on watch for officers on
the 6/6 pattern varied and was up to more than 20% on the 1800-0000 watch.
# Such incidents of sleeping on watch were found within both watchkeeping
patterns, and they mainly occurred during night and early morning watches.
# Participants in all the groups reported relatively high levels of subjective
sleepiness on the KSS scale, which got higher towards the end of a watch and
the end of the week.
# Varying degrees of sleep loss were observed between the watch systems and
depending on whether off-watch periods were disturbed or not. Overall sleep
duration for those on the 4/8 pattern was found to be relatively normal, with
around 7.5 hours per day for those in Team 1 at Chalmers and about 6 hours for
Team 2 at Warsash.# Participants working 6/6 watches were found to get
markedly less sleep than those on 4/8, and data showed a clear split sleeping
pattern in which daily sleep on the 6/6 patternwas divided into two periods
one of between three to four hours and the other averaging between two to three
hours.
# Reaction time tests, carried out at the start and end of each watch, showed
clear evidence of performance deterioration and the slowest reaction times
were found at theend of night watches and among those on the 6/6 patterns. #
Watchkeepers were found to be most tired at night and in the afternoon and
sleepiness levels were found to peak towards the end of night watches. # The
6/6 regime was found to be more tiring than the 4/8 rotas and disturbed
offwatch periods were found to produce significantly high levels of tiredness.
In both watch systems, the disturbed offwatch period was found to have a
profound effect upon levels of sleepiness.
# There was evidence that routine and procedural tasks could be carried out
with little or no degradation, while participants appeared to find it harder to
deal with novelevents, such as collision avoidance or fault diagnosis, as the
voyages progressed.
# Researchers also noted a decline in the quality of the information being
given by participants at watch handovers as the weekprogressed.
======= fm tankker operator =======
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