Figure 2.

Post call napping in interns. (A) The prevalence of napping in the period 9 am–6 pm on the first day post-call was inversely related to the amount of sleep obtained during the on-call night. (B) Sleep lost during the on-call night was partially recuperated by interns through naps on the first day post call. The more sleep interns lost during the on-call night (9 pm–9 am), the more sleep they obtained during the first day post call (9 am–9 pm). However, compared to a regular shift day (7.11 hours sleep per 24 hours), interns were only able to fully recuperate the sleep lost during on-call nights during post call days if they obtained more than 4 hours sleep during on-call nights. All error bars reflect 95% confidence intervals.