Lipitor is a brand name for the drug atorvastatin, which belongs to a group of drugs called statins. Statins are used to lower cholesterol levels in the blood and reduce the risk of heart disease and stroke. According to the NHS [3], common side effects of statins include headache, nausea, muscle pain, and digestive problems. However, the benefits of taking statins usually outweigh the risks.

As for taking Lipitor before bedtime, there is some evidence that it may be more effective in reducing cholesterol levels than taking it in the morning [2]. However, there is no evidence to suggest that taking Lipitor before bedtime causes any specific side effects. According to the British Heart Foundation [2], some people may experience sleep disturbances when taking statins, but this is a rare side effect and not specifically related to taking the medication before bedtime.

It is important to note that Lipitor should be taken as directed by a healthcare professional, and any concerns about potential side effects should be discussed with them. Additionally, it is important to follow a healthy diet and lifestyle while taking Lipitor to maximize its effectiveness in reducing cholesterol levels and lowering the risk of heart disease and stroke.

Sources:
[2] British Heart Foundation. (n.d.). Statins and sleep. Heart Matters Magazine. https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/ask-the-experts/statins-and-sleep
[3] NHS Inform. (2021, February 22). Statins. https://www.nhsinform.scot/tests-and-treatments/medicines-and-medical-aids/types-of-medicine/statins