Figure 1.

Double-raster plot of the simulated night shift protocol. The protocol included two simulated night shifts (from 23:00 to 06:45 h) performed in a laboratory with long-wavelength narrow-bandwidth light (A) and short-wavelength narrow-bandwidth light (B). The night shifts were separated by 4 weeks and the order of conditions was counterbalanced. White bars indicate enrollment and practice session (before the first night shift only) in the laboratory. Black bars indicate assumed sleep periods at home. Colored bars indicate night shifts in the laboratory. Black dots indicate primary test bouts including the Positive and Negative Affect Schedule (PANAS), the Karolinska Sleepiness Scale (KSS), a Psychomotor Vigilance Task (PVT), and a Digit Symbol Substitution Test (DSST). White diamonds indicate salivary dim-light melatonin sampling at home.