The effects of bright light treatment on subjective and objective sleepiness during three consecutive night shifts among hospital nurses – a counter-balanced placebo-controlled crossover study

Bright light treatment significantly reduced heavy eyelids during night shifts.

• Subjective sleepiness was assessed daily and every two hours while awake.
• Objective sleepiness was measured using the Psychomotor Vigilance Task at 05:00 hours during each night shift.
• Bright light exposure did not affect scores on the Karolinska Sleepiness Scale or the Psychomotor Vigilance Task.
• No differences in subjective sleepiness were observed during the three days following night shifts.
• Limitations may include insufficient number of consecutive night shifts and possible timing issues with light exposure.

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