Cholesterol Drug Tied to Sleep Disturbances

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"Simvastatin is fat-soluble, and can penetrate and cross into the brain," Smith explained.

Golomb said: "We did show significant worsening in both sleep quality outcome and sleep problem categories in patients taking simvastatin. Less sleep quality and more sleep problems."

Those participants who had worse sleep also showed a worsening in their aggression scores, compared to people in the other two study groups.

This doesn't mean that patients experiencing sleep problems should take themselves off Zocor or another statin, Smith said. "The broader benefit of decreasing heart attack and stroke must be taken into account," he said.

And patients who find themselves truly sleep-deprived can also talk to their doctor about finding an alternate statin, he said.

More information

Visit the National Sleep Foundation for more on sleep disorders.