My 6 months old still wakes up at night?

It's the pacificer. Your either going to have to get him to stop using it all together or more than likely what will happen is that he'll start using his fingers instead. He just wakes up and wants the one thing that calms him. All of my children stopped with the pacifier about that time and began sucking fingers. As to whether this is going to be more problems for us in the long run, is yet to be seen.