An unusual circadian rhythm in an active duty service member

Vincent Mysliwiec, Panagiotis Matsangas, Tristin Baxter, Nita Lewis Shattuck

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The case of a 29-year-old active duty US Navy sailor with severe sleepiness is presented. He was diagnosed with mild obstructive sleep apnea which did not fully explain his sleepiness. At follow-up, positive airway pressure usage demonstrated a progressive, variable phase delay. His sleep periods aligned with his 5-h on/10-h off (5/ 10) military duty schedule. Treatment with bright light exposure and melatonin resolved his circadian arrhythmia. While it is known that military personnel are habitual shift workers who receive insufficient sleep, there is little documentation of shift work disorders in this population.

Original languageEnglish (US)
Pages (from-to)113-115
Number of pages3
JournalSleep and Biological Rhythms
Issue number1
StatePublished - Jan 1 2016
Externally publishedYes


  • Military
  • Shift work
  • Shift work disorder
  • Ship crews

ASJC Scopus subject areas

  • Physiology
  • Neuropsychology and Physiological Psychology
  • Neurology
  • Physiology (medical)


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