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Circadian-informed lighting improves vigilance, sleep, and subjective sleepiness during simulated night-shift work
Lighting timed for the body’s clock improves alertness, sleep, and tiredness during simulated night shifts
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Abstract
Circadian-informed lighting resulted in 50% fewer lapses in cognitive performance during simulated night shifts compared to dim control lighting.
- Participants experienced a reduction in psychomotor vigilance task lapses from an average of 15.6 to 7.4 by the end of the simulated shift work.
- Lower sleepiness scores were noted around the midpoints of night shifts on days 6 and 7 with circadian-informed lighting.
- Sleep duration increased by an average of 52 minutes by day 7 when using circadian-informed lighting compared to control lighting.
- Effects on other cognitive performance tasks were inconsistent and not clearly defined.
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Key numbers
7.4 vs. 15.6
Decrease in PVT Lapses
PVT lapses under circadian-informed vs. control lighting conditions.
52 minutes
Increase in Sleep Duration
Total sleep time by day 7 with circadian-informed vs. control lighting.
KSS scores on days 6 and 7
Lower KSS Ratings
Karolinska Sleepiness Scale ratings with circadian-informed vs. control lighting.