My Son Bed

Our son has been complaining about his twin bed that his been using since he was 2 1/2 years old. He said, that his bed is not comfortable than our bed that's why he likes to sleep with us even his almost 9 years old. Well, once in a while we let him sleep with us because we like to have him in our bedroom as long as he likes. We are thinking to get sleep number bed for his bedroom, but we need to know if they have full size bed if not maybe queen size so if he sleep with us, hubby and I can transfer to his bedroom because we can't really fit in queen size bed the three of us.