Analysis of Sleep, Mood, Behavior, and Suicide Risk of Sailors on the USS Ashland
Masters thesis — Naval Postgraduate School, 2020. Full text: https://archive.org/details/analysisofsleepm1094566115
Evidence
Analysis of Sleep, Mood, Behavior, and Suicide Risk of Sailors on the USS Ashland
The striking finding isn't that one ship's sailors are tired — it's that the whole fleet is tired, and tiredness is quantified against collisions and suicides; chronic sleep deprivation is a fleet-wide condition with documented lethal stakes.
Sailors on the USS Ashland (LSD-48) averaged 6.33 hours of sleep per night (SD 1.14) — significantly below the recommended 7+ hours — and a comparison against 37 other Navy platforms found Ashland sailors were not significantly different from the rest of the fleet: all 38 groups together averaged 6.35 hours, with only 13% of the studies finding sailors averaging more than 7 hours; the study links the sleep shortfall to mood, behavior, and suicide risk, motivated by "recent collisions and multiple suicides" as the cost of failure.
Why it matters
The striking finding isn't that one ship's sailors are tired — it's that the whole fleet is tired, and tiredness is quantified against collisions and suicides; chronic sleep deprivation is a fleet-wide condition with documented lethal stakes.
Use when: When every unit measures below the bar, it's not a unit problem — it's a system problem; the Ashland study makes the case that fleet sleep is a structural readiness issue, not a discipline one.