I hurt my knee and have to go in for a second mri tomorrow because the first one wasn't clear. This time, the doctor prescribed 10mg of Valium before the scan. I've never had Valium before. Will it make me sleep or keep me completely still from moving my knee? I'm definitely nervous and agitated because I want to know already what's going on with my knee. That's why I'm hoping that this Valium will knock me out or keep me still.