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. Author manuscript; available in PMC: 2011 Dec 29.
Published in final edited form as: Chronobiol Int. 2010 Jan;27(1):161–180. doi: 10.3109/07420521003648604

Figure 5. Subjective sleepiness plotted relative to time of day and circadian phase.

Figure 5

Data are presented as mean ± SE and separated by day to display the lack of increased sleepiness on day 2 of the protocol. See Table 2 for statistical test results.