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. 2021 Apr 17;44(10):zsab103. doi: 10.1093/sleep/zsab103

Figure 1.

Figure 1.

Sleep regularity metrics. (A) Raster plot of a 28-day sleep–wake pattern with a weekly variation of 1 h later and 1 h longer sleep on weekends than weekdays. The gray box marks six days of the pattern used to illustrate the five sleep regularity metrics in panels B–F. (B) Social jet lag (SJL). (C) Standard deviation (StDev). (D) Interdaily stability (IS). (E1 and E2) Composite phase deviation (CPD). (F) Sleep regularity index (SRI). Note: Only clock times 0-8 are shown for space reasons.