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. 2012 Oct 22;591(Pt 1):353–363. doi: 10.1113/jphysiol.2012.239046

Figure 1. Study protocol.

Figure 1

Example of a raster plot for a phase delay protocol (A) and a phase advance protocol (B). The y-axis depicts consecutive study days and the x-axis clock time. White and grey bars indicate wake episodes in ambient light of <150 lux or <3 lux, respectively; black bars indicate scheduled sleep in 0 lux. ‘L’ indicates the 6.5 h light exposure and the black triangles show the timing of dim light melatonin onset (DLMO) before and after the light exposure. C and D show the corresponding plasma melatonin profiles during constant routines (CR) for the subjects plotted in A and B, respectively. The dashed line indicates the 25% value of the fitted peak-to-trough-amplitude DLMO.