Based on the information available, there is no definitive evidence to suggest that Rem sleep (Rapid Eye Movement sleep) is affected by taking Lipitor (Atorvastatin). Lipitor is a statin medication used to treat high cholesterol and reduce the risk of stroke and heart attack [1].

Lipitor works by reducing the production of cholesterol in the body, which can help prevent the buildup of plaques in the arteries [1]. There are no studies or reports indicating that Lipitor has a direct impact on Rem sleep.

However, it is important to note that Lipitor, like all medications, can have side effects. Some of these side effects may indirectly affect sleep patterns. For example, Lipitor can cause muscle pain and weakness, which could potentially make it difficult to get a good night's sleep [1].

Additionally, Lipitor can interact with other medications, which could potentially impact sleep. It is always recommended to speak with a healthcare provider about any potential interactions or side effects [1].

In summary, while there is no direct evidence to suggest that Lipitor affects Rem sleep, it is always important to speak with a healthcare provider about any potential side effects or interactions when starting a new medication.

Sources:
[1] DrugPatentWatch.com - Lipitor (Atorvastatin) [Online] Available from: <https://www.drugpatentwatch.com/drugs/lipitor>