I have terrible insomnia anyway, mostly due to anxiety and based on a loss from back in 2010.
It's taken several forms...first, being able to fall asleep and not being able to fall back asleep once I woke up 3 or 4 times a night...now I can stay up all night and sleep better during the day, but try not to let that happen.
Regardless, when I sleep I have terrible dreams that I don't ever really remember, but a jumble of terrible, anxious thoughts and images that used to make it almost impossible to get ready for work in the mornings the next day (when I had a job), because I was so anxious that all I wanted to do is cry.
I now take 4 mg of klonopin before attempting to sleep. If I manage to sleep (my anxiety can win over the klonopin, and it has on many occasions), it keeps the bad jumble of dream images away, although I have other dreams sometimes. (My pdoc says klonopin should help with my anxiety into the next day, but I don't care what he says, it doesn't...)