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. 2012 Apr 23;590(Pt 13):3103–3112. doi: 10.1113/jphysiol.2011.226555

Figure 4. Subjective sleepiness and melatonin concentrations during LE day.

Figure 4

Mean KSS z-scores (symbols with line) and plasma melatonin levels (continuous line) are shown for the control, 0.2 h, 1.0 h, 2.5 h, 4.0 h and 6.5 h duration groups (top to bottom). The grey area represents the 1 lux level. The white boxes (continuous lines) represent the ∼10,000 lux LE. The dotted lines show the timing of the constant posture (0-4.5 in the current study; 0-6.5 in the groups studied previously (Gronfier et al. 2004).