Residual effects of zopiclone 7.5 mg on highway driving performance in insomnia patients and healthy controls: a placebo controlled crossover study.

Figure 1 presents mean ± SE SDLP values recorded after placebo and zopiclone 7.5 mg for each group separately. Analysis showed a highly significant overall treatment effect on SDLP ( F 1,45 = 33.86, p < 0.001).

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After placebo, however, mean SDLP in the chronic users group was elevated compared with the infrequent users and healthy controls, although the difference did not reach statistical significance.

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