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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Sleep Duration in Rough Sea Conditions.

Panagiotis Matsangas1, Nita L Shattuck, Michael E McCauley

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Ship crew sleep duration significantly increased in rough seas (sea state 5-6) compared to calmer conditions. Motion sickness and sopite syndrome were identified as potential stressors influencing sleep patterns in naval personnel.

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Area of Science:

  • Maritime science
  • Human performance
  • Sleep research

Background:

  • Shipboard environmental motion impacts crew sleep.
  • Harsh motion can disrupt sleep, while mild motion may enhance it.
  • Understanding sleep needs in varying sea conditions is crucial for assessing human performance.

Purpose of the Study:

  • To assess sleep duration in different sea conditions.
  • To investigate the relationship between sea state and sleep patterns in naval crewmembers.

Main Methods:

  • Fifty-two U.S. Navy crewmembers participated.
  • Sleep was monitored using wrist-worn actigraphy.
  • Motion sickness and sopite syndrome were evaluated via standardized questionnaires.

Main Results:

  • Rough seas (sea state 5-6) led to increased motion sickness and sopite syndrome.
  • Sleep duration was significantly longer in sea state 5-6 (9.04 ± 2.90 h) compared to sea state 4 (7.23 ± 1.65 h) and sea state 3-4 (6.97 ± 1.24 h).
  • A 25-30% increase in sleep duration was observed in rougher seas.

Conclusions:

  • Sleep duration increased significantly in rough seas, though causal factors remain inconclusive.
  • Motion sickness and sopite syndrome appear to be predominant stressors affecting sleep.
  • Increased sleep needs in severe motion environments should inform scheduling and manning requirements for modern ships.