A circadian-informed lighting intervention accelerates circadian adjustment to a night work schedule in a submarine lighting environment

Jun 27, 2024Sleep

Lighting timed to the body clock speeds up adjustment to night shifts in a submarine

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Abstract

Circadian-informed lighting produced a mean 5.6 hours greater delay in core body temperature timing compared to standard lighting after simulated night shifts.

  • Significant interactions were observed between lighting conditions and the timing of core body temperature and melatonin onset delays.
  • Circadian-informed lighting resulted in a 4.2-hour greater delay in melatonin onset timing compared to standard lighting.
  • The study involved 19 healthy participants, with assessments conducted over two separate 8-day visits.
  • Lighting conditions were tested under simulated night work to evaluate their effects on circadian adjustment.

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Key numbers

4.2 hours
Timing Delay Increase
Circadian-informed lighting vs. standard lighting after four night shifts.
5.6 hours
Delay Increase
Circadian-informed lighting vs. standard lighting after four night shifts.
19 of 24
Participant Completion
Total participants initially planned for the study.

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