I just wanted to say that I had my only mercury filling removed 3 weeks ago, and I have dreamt every night since and had little difficulty remembering them most mornings. I haven't even tried to dream or remember my dreams.
I used to dream a lot as a child (possibly before I had fillings?), but since adolescence I hardly remember dreaming except very occasionally.
Mercury fillings are poison. My advice to anyone who doesn't dream and wants to is to get those filling replaced (using the correct protocol).
I have heard that metal in the mouth acts as a battery and can produce an electric current far in excess of the currents produced by the body. As a result our own signals can get confused as the body tries to compensate. No wonder I spent half my life unable to remember my dreams. All those lost memories ...