Figure 3.

Hourly scores on the 10-cm visual analog scales for calm and tense and the 5-point scale for nervous after 2 nights of 10 hours in bed (left panels) and after 2 nights of 4 hours in bed (right panels). The solid lines represent the median and the dotted lines represent quartiles 1 and 3. There were no significant effects of bedtime duration on any of these 3 markers of self-perceived stress measures.