Lipitor is a medication used to lower cholesterol levels and reduce the risk of heart disease [1]. According to a study published in the Journal of Clinical Sleep Medicine, Lipitor does not appear to have a significant impact on REM sleep quality [2]. However, it is important to note that insomnia is a potential side effect of Lipitor [3]. Insomnia is a sleep disorder that can cause difficulty falling asleep, staying asleep, or waking up too early. While the study mentioned above did not find a significant impact on REM sleep quality, it is possible that Lipitor could contribute to insomnia in some individuals. If you are experiencing difficulty sleeping while taking Lipitor, it is important to speak with your healthcare provider to determine the best course of action.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4624738/
[3] https://www.aarp.org/health/drugs-supplements/info-04-2013/medications-that-can-cause-insomnia.html