According to the sources provided, taking Lipitor (atorvastatin) at night may lower LDL (low-density lipoprotein) cholesterol levels. Atorvastatin is a medication that belongs to the class of drugs known as statins. Statins work by blocking the enzyme that produces cholesterol in the liver, which leads to a decrease in LDL cholesterol levels.

A study published in the journal "Atherosclerosis" found that taking atorvastatin at night led to a greater reduction in LDL cholesterol levels compared to taking it in the morning. The study also found that taking atorvastatin at night led to a greater increase in HDL (high-density lipoprotein) cholesterol levels, which is known as the "good" cholesterol.

Another study published in the "Journal of Clinical Lipidology" also found that taking atorvastatin at night led to a greater reduction in LDL cholesterol levels compared to taking it in the morning. The study also found that taking atorvastatin at night was associated with a greater improvement in other lipid parameters, such as triglyceride levels.

Furthermore, taking statins at night has been shown to be more effective in reducing the risk of cardiovascular events, such as heart attacks and strokes. This is because cholesterol production in the liver is highest at night, and taking statins at this time can more effectively block this production.

In conclusion, taking Lipitor at night may lower LDL cholesterol levels and improve other lipid parameters, such as triglyceride levels and HDL cholesterol levels. Additionally, taking statins at night has been shown to be more effective in reducing the risk of cardiovascular events. However, it is important to consult with a healthcare provider before making any changes to medication timing or dosage.

Sources:
[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC214096/
[2] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[3] https://www.healthline.com/health/high-cholesterol/why-should-you-take-statins-at-night