Cheratussin AC and dreams

I don't recall having any weird dreams or nightmares. I've been taken this syrup for 3 days now, when I wake up, a couple times during the day and before I go to sleep. It's doing what the site said, it's loosening up my mucus crud and I cough it up and spit it out. Mostly in the morning, like I'm coughing up a lung. I'm still coughing and I hope I get better soon.

I only have taken maybe 3 or 4 doses, and have been having real bad nightmares. Just wondered if this was common for anyone else.