According to the sources provided, Lipitor (atorvastatin) is a medication used to lower cholesterol levels and reduce the risk of heart disease and stroke [1]. While insomnia is not listed as a common side effect of Lipitor, it is mentioned as a possible side effect on the AARP website [2]. However, the British Heart Foundation states that there is no evidence to suggest that statins, including Lipitor, cause sleep disturbances [3].

It is important to note that each individual may react differently to medications, and some may experience side effects while others do not. If you are experiencing sleep disturbances while taking Lipitor, it is recommended to speak with your healthcare provider to discuss possible solutions or alternative medications.

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