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Sunlight Exposure, Work Hours, Caffeine Consumption, and Sleep Duration in the Naval Environment.

Abstract Sailors in the U.S. Navy are habitual shiftworkers, often experiencing circadian misalignment due to their irregular work/rest schedules. This study assessed the effect of sunlight exposure, work hours, and caffeinated beverage consumption on the daily sleep duration of crewmembers of a U.S. Navy ship during a 2-wk underway period.
PMID
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Authors

Mayor MeshTerms

Caffeine

Central Nervous System Stimulants

Military Personnel

Sleep

Sunlight

Work Schedule Tolerance

Keywords
Journal Title aerospace medicine and human performance
Publication Year Start




PMID- 28539147
OWN - NLM
STAT- MEDLINE
DA  - 20170525
DCOM- 20170731
LR  - 20170731
IS  - 2375-6314 (Print)
IS  - 2375-6314 (Linking)
VI  - 88
IP  - 6
DP  - 2017 Jun 01
TI  - Sunlight Exposure, Work Hours, Caffeine Consumption, and Sleep Duration in the
      Naval Environment.
PG  - 579-585
LID - 10.3357/AMHP.4721.2017 [doi]
AB  - BACKGROUND: Sailors in the U.S. Navy are habitual shiftworkers, often
      experiencing circadian misalignment due to their irregular work/rest schedules.
      This study assessed the effect of sunlight exposure, work hours, and caffeinated 
      beverage consumption on the daily sleep duration of crewmembers of a U.S. Navy
      ship during a 2-wk underway period. METHODS: Working in an artificially lit area 
      with no access to sunlight during work hours, U.S. Navy crew members (N = 91)
      used daily logs to report their daily activity, caffeinated beverage consumption,
      and exposure to sunlight while off-duty; sleep was assessed by wrist-worn
      actigraphy. RESULTS: Hours of sunlight exposure, work duration, and the amount of
      coffee/tea/soft drinks were statistically significant predictors of sleep
      duration. On average, crewmembers who reported more than one half-hour of
      sunlight each day slept on average approximately 40 min (10%) less than their
      peers working the same shifts who received less than one half-hour of sunlight
      (on average 6.05 +/- 0.90 h vs. 6.71 +/- 0.91 h, respectively). DISCUSSION:
      Exposure to sunlight, work hours, and consumption of caffeinated beverages are
      important factors when planning watchstanding schedules at sea. Even though
      further research is needed, our results suggest that even brief exposure to
      sunlight may contribute to circadian misalignment that negatively affects sleep
      in the operational environment. Educating crewmembers about sleep hygiene,
      especially the important roles played by sunlight and caffeine, could potentially
      improve the sleep and fatigue levels of this population of maritime
      shiftworkers.Shattuck NL, Matsangas P. Sunlight exposure, work hours, caffeine
      consumption, and sleep duration in the naval environment. Aerosp Med Hum Perform.
      2017; 88(6):579-585.
FAU - Shattuck, Nita L
AU  - Shattuck NL
FAU - Matsangas, Panagiotis
AU  - Matsangas P
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Aerosp Med Hum Perform
JT  - Aerospace medicine and human performance
JID - 101654770
RN  - 0 (Central Nervous System Stimulants)
RN  - 3G6A5W338E (Caffeine)
SB  - IM
SB  - S
MH  - Actigraphy
MH  - Adult
MH  - Beverages
MH  - *Caffeine
MH  - *Central Nervous System Stimulants
MH  - Drinking Behavior
MH  - Fatigue
MH  - Female
MH  - Humans
MH  - Male
MH  - *Military Personnel
MH  - *Sleep
MH  - Sleep Disorders, Circadian Rhythm/*physiopathology
MH  - *Sunlight
MH  - United States
MH  - *Work Schedule Tolerance
MH  - Young Adult
EDAT- 2017/05/26 06:00
MHDA- 2017/08/02 06:00
CRDT- 2017/05/26 06:00
AID - 10.3357/AMHP.4721.2017 [doi]
PST - ppublish
SO  - Aerosp Med Hum Perform. 2017 Jun 1;88(6):579-585. doi: 10.3357/AMHP.4721.2017.