Smoking at night may be responsible for insomnia, study
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According to a study published by Sleep health, smoking cigarettes at night have a stronger association with poor sleep than does smoking earlier times in the day.

This study examined the smoking status and its associations with insomnia severity and sleep duration while considering the potential role of smoking time.

Data were derived from the Sleep and Healthy Activity Diet Environment and Socialization Study, a community-based study of 1007 adults. Smoking status and time of smoking were self-reported. Insomnia was assessed and categorized as none, mild, and moderate-to-severe. Sleep duration was assessed and categorized as very short, short, normal, and long. Ordinal and multinomial logistic regressions were used to determine the association of smoking status including smoking time with insomnia severity and sleep duration controlling for sociodemographic covariates.

Compared to nonsmoking, smoking was associated with experiencing increased insomnia as well as very short and short sleep. Night-time smoking was significantly associated with greater insomnia and shorter sleep duration.

In particular, smoking is associated with increased insomnia severity and shorter sleep duration, particularly nightly smoking. Sleep health should be considered in smoking cessation efforts.

Source: https://doi.org/10.1016/j.sleh.2020.10.006
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