Glucophage - I am having nightmares since I started taking Metformin. Should I be worried? Will it?

So, an update: I have figured out how to combat the nightmares. It's important to eat with the drug which we all already know but the key is what kinds of foods and timing. Stay away from overly processed foods. That really does help. Also I have found that it's important to have good calories for your body to burn. Part of what metformin does is make you less insulin resistant. So if you eat it with empty calories it seems to create side effects like the nightmares and the gastrointestinal effects also. I used to get really irritating stomach aches as well.
In regards to timing; I have found that taking it as close to the same time each day as possible is good for getting your body conditioned to expect the metformin. So coupling the timing with good foods, it has been really helpful.
I do not profess to be an expert. This is just what has worked for me. I highly recommend that if you are having side effects that make your life at all more difficult that you talk to your doctor and make a plan for how to combat the side effects.
Good luck!! :)

Metformin is a leading cause of nightmares in users. Contact your doctor immediately. Sleep deprivation will result as well as an erosion of the spirit and attitude of the user combined with fears of sleep.

I just started taking Metformin and am also having some wicked nightmares. Did your body adjust?

Since this isn't a listed side effect of it, I don't know what to tell you. Are you sure its not coincidence? It doesn't effect our brain.