Hello I am Tarni Sophia from Australia. Aching legs when lying down can be caused by various factors, including poor circulation, restless leg syndrome, muscle fatigue, or underlying health conditions such as varicose veins or nerve compression. The discomfort often intensifies at night when the body is at rest, leading to disrupted sleep. Treatment options may include lifestyle changes, such as improving circulation through leg exercises or using compression stockings, as well as addressing the underlying condition with medication or physical therapy. Consulting a healthcare professional is crucial for proper diagnosis and tailored treatment plans.