Lipitor is a brand name for the medication atorvastatin, which is commonly used to lower cholesterol levels in the blood. According to the first source [1], there is no information available on whether Lipitor can cause insomnia or sleep disturbances. However, the second source [2] states that some medications, including statins like Lipitor, can cause sleep problems such as insomnia. This is because statins can affect the production of melatonin, a hormone that regulates sleep-wake cycles. The third source [3] also confirms that statins can cause sleep disturbances, but notes that the benefits of taking the medication generally outweigh the potential side effects.

In conclusion, while the first source does not provide any information on the relationship between Lipitor and insomnia or sleep disturbances, the second and third sources suggest that statins like Lipitor can indeed cause sleep problems. It is important for patients taking Lipitor to be aware of this potential side effect and to discuss any concerns with their healthcare provider.

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