How should you respond when a patient asks why they must wear anti-embolism stockings at night?

The response indicating that anti-embolism stockings help prevent clots from forming in the legs is correct because the primary purpose of these stockings is to promote venous return and reduce the risk of venous thromboembolism (VTE). When patients experience reduced mobility or have certain medical conditions, blood flow in the lower extremities can become sluggish, increasing the likelihood of clot formation. Anti-embolism stockings apply graduated compression to the legs, which helps to enhance blood flow back to the heart and prevent the pooling of blood in the veins, thereby significantly reducing the risk of clots.

This understanding is crucial for patients to motivate them to comply with wearing the stockings consistently, even at night, when they may be less active. While increased circulation and temperature control of the legs can be secondary benefits of wearing the stockings, the main focus of their design and use is on preventing deep vein thrombosis and ensuring proper circulation.