Melatonin dreams in Thoughts on thoughts

I’ve always had insomnia since I was 16 sleep has been kind of a lost cause.
I am not sure exactly why but I just never really felt like it was important. As I got older it stayed so when I worked I tried doing night shifts since I was awake anyway. I started using nyquil to help get me to sleep and it helped a lot! But I was told later by my doctor that it would really mess with my liver and kidneys so I tried melatonin instead....
Turns out melatonin gives me wicked nightmares! I dream about stuff I would only write about....I’m wondering if anyone else has nightmares when taking this medication.