Just a warning with mixing OTC meds with prescription meds. I was having trouble sleeping so I tried mixing OTC antihistamines with my nighttime meds and every time I did it, I had trouble breathing at night. Like, I'd start to fall asleep and stop breathing, and wake myself up gasping for breath. I finally realized it only happened when I added antihistamines to the mix and when I stopped doing that, it stopped happening. Melatonin gives me racing thoughts and extreme anxiety.

I use music, meditation, reading or doing something sedate with no screens (no computer or tv) before bed, and Seroquel to help me sleep.