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Compared to nonsmoking, smoking was associated with experiencing increased insomnia (odds ratio=2.5, 95% confidence interval [CI] 1.9, 3.4, P .001) as well as very short (relative risk ratio=1.9, 95% CI 1.1, 3.3) and short (relative risk ratio=1.5, 95% CI 1.0, 2.3) sleep (vs normal sleep duration). Night-time smoking was significantly associated with greater insomnia and shorter sleep duration. Findings provide evidence that smoking is associated with increased insomnia severity and shorter sleep duration, particularly nightly smok