Just a guess on my part, but I suspect it might be due to the CBD Gummy Bears that I tried for Insomnia. I dreamt that I was walking down a dark road at night and a car came along with the driver reaching out the window with a gun in his hand trying to shoot me. He tried several times and missed.. I was upset all night because I did not have a gun to shoot back. Very strange----I dream but never have nightmares.
I think there is a good chance it happened due to your new and improved gummy bears. You'll have to see if it becomes a regular occurence or just your body getting used to them. I checked online. The only listed side effects are: Loss of appetite. Dry mouth. Fatigue. Dizziness. Nausea and/or diarrhea. Changes in mood. Of course, it could still be your body adjusting to a new substance since you have other health issues.
Other than your bad dreams do the Gummy Bears work @Lon Tanner.. as I too suffer insomnia.. I call it my curse. I generally use herbal extractions like valerian or melatonin but sometime I am forced to use a lab drug to put me off. So adding induces nitemares to those other side effects. Is CBD the brand name. Also are they sugar free or reduced?
To piggy back on @Bess Barber. I saw a program about side effects of meds. They are reported by users (probably those during a research and development trial). Maybe no-one reported it as one, yet. If I experience symptom(s) that I've never had before taking any new med it's a side effect to me.