The effect of bright light on sleepiness among rapid-rotating 12-hour shift workers

• DOI: 10.5271/sjweh.3086
• Publication Date: 2011-01-28T13:20:00Z
• Authors: Khosro Sadeghniia...; Zohreh Yazdi; Hassan Jahanihashemi; Omid Aminian
• Keywords: Night work

About 20% of workers in industrialized countries are shift and more than half them work on night or rotating shifts. Most complain sleepiness due to lack adjustment the circadian rhythm. In simulated night-work experiments, scheduled exposure bright light has been shown reduce these complaints. Our study assessed effects during an industrial setting.In a cross-over design, 94 at ceramic factory were exposed either (2500 lux) normal (300 breaks We initiated 20-minute between 24.00 02.00 hours. Sleepiness ratings determined using Stanford Scale 22.00, 24.00, 04.00 hours.Under conditions, peaked 02:00 A significant reduction (22% compared conditions) was observed after light.Exposure may be effective reducing among workers.