The findings cannot prove that smoking directly impairs sleep, since smokers may have other habits that could affect their shut-eye such as staying up late to watch TV or getting little exercise, Cohrs told Reuters Health in an email.
But there is also reason to believe the stimulating effects of nicotine may be to blame.
"If you smoke and you do suffer from sleep problems, it is another good reason to quit smoking," Cohrs said.
Poor sleep quality may not only make your waking hours tougher. Some studies have also linked habitually poor sleep to health problems like obesity, diabetes and heart disease.
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