Is it a good idea to wear an upper retainer with a lower night-guard for teeth grinding at night?

I had Invisalign treatment done to straighten my teeth a few years ago. When finished, I chose to have a wire glued to the back of my lower teeth to keep it in place, and then wear Essix retainers for my upper teeth during the nighttime. Afterwards, I found out that my lower two incisor molars were wearing down to the roots due to my grinding at night. I was advised to have a lower night guard made, but I still need to wear upper retainers to keep my teeth aligned. Would it be ok to wear both?