Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels in the blood. Insomnia is a common side effect of many medications, including some cholesterol-lowering drugs [2]. According to AARP, some medications can cause insomnia by disrupting sleep patterns, such as beta-blockers, corticosteroids, and some antidepressants. However, Lipitor is not specifically mentioned as a medication that can cause insomnia [2].

The British Heart Foundation states that there is limited evidence linking statins, including Lipitor, to sleep disturbances such as insomnia. They mention that a small number of patients taking statins have reported sleep problems, but these reports are not consistent and the relationship between statins and sleep is not fully understood [3].

DrugPatentWatch provides information on the patents and exclusivity of drugs, but does not provide information on the side effects of Lipitor [1].

In conclusion, while insomnia is a possible side effect of many medications, including some cholesterol-lowering drugs, Lipitor is not specifically mentioned as a medication that can cause insomnia according to AARP. The British Heart Foundation mentions that there is limited evidence linking statins, including Lipitor, to sleep disturbances such as insomnia, but the relationship between statins and sleep is not fully understood [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.aarp.org/health/drugs-supplements/info-04-2013/medications-that-can-cause-insomnia.html
[3] https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/ask-the-experts/statins-and-sleep