Comparison 2. Bright light alone at night versus normal light (300 lux) plus placebo capsule.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Sleepiness during the night shift (5‐min. Reaction Time Test ‐ milliseconds)	1		Mean Difference (Fixed, 95% CI)	Totals not selected
2 Total sleep time, next day (Actiwatch ‐ hours)	1		Mean Difference (Fixed, 95% CI)	Totals not selected
3 Sleep onset latency, next day (Actiwatch ‐ minutes)	1		Mean Difference (Fixed, 95% CI)	Totals not selected
4 Sleep efficiency, next day (Actiwatch ‐ %)	1		Mean Difference (Fixed, 95% CI)	Totals not selected