Snoozing While Cruising: Nap Frequency as a Fatigue-Management Indicator and Risk Marker in Naval Operations

Fatigue and insufficient sleep remain critical challenges for health, safety, and readiness in naval operations and other high-demand occupations. This study examined whether nap frequency was associated with occupational stress, burnout, impaired functioning, and health outcomes in a large sample of active-duty US Navy sailors. Napping frequency was associated with lower odds of high job stress and impaired functioning, a pattern consistent with the broader experimental and operational literature suggesting that naps may support acute fatigue management when sleep opportunities are constrained. However, more frequent napping was also linked to higher odds of burnout, and US Navy sailors who napped on five or more days per week had higher odds of reporting an elevated number of poor mental health days. By contrast, nap frequency was not significantly associated with the number of poor physical health days. These findings suggest that planned nap opportunities may be useful within fatigue management programs when sleep opportunities are constrained, but nap frequency should not be viewed as a substitute for sufficient total sleep opportunity or systemic approaches to chronic occupational strain. The results carry implications for both military and civilian domains, including healthcare, aviation, and transportation, where fatigue countermeasures are essential to individual well-being and organisational safety.