Figure 5.

Effects of filtering short wavelengths (<480 nm) from ambient light during night shifts on subjective mood and daytime sleepiness. Subjective mood and daytime sleepiness were assessed at the end of each study week using the CES-D (A) and ESS (B) scales, respectively. Data represent mean ± SEM. Data were subjected to two-factor (group × time) mixed-model ANOVA followed by Dunnett’s post hoc analysis using the comparator as the control group. *Statistically different as compared with the comparator condition.