Lipitor is a medication that is commonly used to lower cholesterol levels in the body. While the medication is effective in reducing cholesterol, it may also have an impact on sleep patterns. According to the British Heart Foundation [3], statins, including Lipitor, have been linked to sleep disturbances such as insomnia and nightmares. While the exact mechanism behind this is not yet fully understood, it is believed that statins may interfere with the production of melatonin, a hormone that regulates sleep. Additionally, the AARP [2] notes that statins may cause muscle pain and cramps, which can also disrupt sleep. It is important to note that not all individuals who take Lipitor will experience sleep disturbances, and those who do may find that the symptoms improve over time. If you are experiencing sleep disturbances while taking Lipitor, it is important to speak with your healthcare provider to determine the best course of action.

Sources:
[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