Figure 2.

Individual SDLP (cm) differences from placebo (distinguishing observations from subjects whose driving tests were prematurely stopped due to somnolence), mean and 90% confidence interval by Treatment and Day, following bedtime administration of suvorexant 20 mg, 40 mg single dose (Day 2) and multiple doses (Day 9), and single dose of zopiclone 7.5 mg (Day 2 and Day 9). n = 28 on Day 2, n = 27 on Day 9. Horizontal dashed lines indicate thresholds for impairment (> 2.4 cm) and improvement (< −2.4 cm). Only the SDLP data used for the statistical analysis are shown, which includes 4 prematurely terminated tests (black triangles).