The right knee hurts when you move it at night, but not when you don’t move it. Consider that it is related to osteoarthritis, trauma and synovitis. 1. Osteoarthritis: with age, the joints will appear degenerative disease, joint cartilage degeneration damage, in the night time, if the knee joint activities will cause stimulation of the joints, thus causing pain. 2. Trauma: after the right knee injury, if there is meniscus injury, ligament injury, fracture, etc., when the joint activity, it will also cause irritation to the injured part, which will cause pain in the right knee. 3. synovitis: synovitis is caused by trauma, infection, degeneration and other reasons, these factors will cause the inflammatory reaction of the synovial membrane, in the knee joint activities, will also cause pain, usually accompanied by joint swelling. It can be seen that the causes of sleeping right knee movement is not pain not pain is very much, if the pain is more serious or frequent attacks, you should go to the hospital in time to find out the cause of the disease, and then targeted treatment.