Abstract 3725: Simvastatin but Not Pravastatin Affects Sleep: Findings from the UCSD Statin Study
Background: Case reports have suggested possible effects of lipophilic statins on sleep in some subjects. Most randomized studies evaluating the effect of statins on sleep have had small sample size and short duration (≤ 6 weeks). Whether statins affect sleep on average, favorably or adversely, has been unclear.
Goal: To assess the effects of lipophilic and hydrophilic statins on sleep.
Subjects: 1016 adult men and women without diabetes or heart disease, with LDL-cholesterol 115–190mg/dL.
Design: Randomized double blind placebo-controlled trial of simvastatin 20mg, pravastatin 40mg or placebo for 6 months. Sleep was a prespecified secondary outcome. It was assessed by both an adaptation of the Leeds sleep scale (a visual analog scale of sleep quality); and a rating scale of sleep problems. Both items were measured at baseline and on-treatment.
Analysis: Baseline comparability of randomization groups including sleep measures was affirmed. T-test of mean on-treatment sleep scores across randomization groups was performed. This complemented regression analyses, adjusted for baseline values of the respective sleep assessment.
Results: Groups were comparable at baseline on variables including both sleep measures. Simvastatin use was associated with significantly worse sleep quality, and significantly greater reported sleep problems than either pravastatin or placebo, by t-test and regression analyses. Pravastatin did not differ significantly from placebo on any sleep outcome.
Conclusion: Findings were compatible with the hypothesis that statins may impair sleep in some subjects, and that this impairment may arise selectively with lipophilic statins.