@tisme, Yes it’s not advisable to wear your partial dentures at night.
I know you’re concerned about bruxism when you no longer have any teeth on your lower arch. With nothing remaining to bite against technically you won’t be dealing with bruxism (grinding your teeth). As I mentioned before, it’s difficult to know how your lower jaw will react in regards to wanting clench together. You’ll still be able to do that to a certain extent. Your lower jaw will still close but at a deeper resting point. You may initially feel some discomfort in your TMJ area as the muscles which were used to stopping short, will now be having to stretch a little further until it meets with your upper arch. But who knows, without the teeth that are bothersome right now, you may no longer have the desire to clench together.
What are you most worried about with your TMJ issues and bruxism?
Your dentist will be the person to have this discussion with. I think the best place to start is by scheduling a consultation appointment with your dentist first. We used to do that all the time for patients in the clinic where I worked. It may help ease some of your concerns and anxiety to sit down and talk it through with your dentist. To help you with that appointment write your questions and concerns down in a notebook so you can take it with you. It’s helpful referring to a note pad because it’s too easy to get side-tracked during an appointment otherwise.
Have you discussed your situation with your dentist?