According to the sources provided, Lipitor (atorvastatin) may potentially cause sleep disturbances such as insomnia in some individuals. AARP [1] lists statins, including Lipitor, as medications that can cause insomnia. Statins work by reducing the production of cholesterol in the liver, which can also affect the production of other substances, including melatonin, which is essential for regulating sleep. However, not all individuals who take Lipitor will experience sleep disturbances, and the effects on sleep may vary depending on the individual.

BHF [2] states that while some people have reported sleep disturbances when taking statins, including Lipitor, the evidence is limited and inconclusive. The article suggests that if an individual is experiencing sleep disturbances while taking Lipitor, they should speak to their doctor, who may recommend a change in dosage or medication.

DrugPatentWatch [3] does not mention any sleep disturbances as a side effect of Lipitor, but it is important to note that this website primarily provides information on drug patents and may not list all potential side effects.

In conclusion, while there is some evidence to suggest that Lipitor may potentially cause sleep disturbances in some individuals, the effects may vary, and not all individuals who take Lipitor will experience sleep disturbances. If an individual is experiencing sleep disturbances while taking Lipitor, they should speak to their doctor, who may recommend a change in dosage or medication.

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