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. 2012 Jun 28;7(6):e39735. doi: 10.1371/journal.pone.0039735

Figure 7. Scores obtained on the Epworth Sleepiness Scale at 6 a.m., 10 a.m., 2 p.m., and 6 p.m. after either a normal night’s sleep (Normal night) or a night of TSD (Night of TSD).

Figure 7

The higher the index, the higher the sleepiness level.