Sleep struggles with an ADHD kid

Sleep has been the hardest part of parenting our ADHD kid. I don’t think I was prepared for how intense bedtime would be. It turns into a full negotiation every night extra questions, extra energy, racing thoughts at 9pm. We tried melatonin hoping it would be the simple solution at first it seemed to help but now it’s backfiring with restless sleep, vivid dreams or waking up at 3am ready to start the day. I genuinely can’t tell if it’s the ADHD, the timing or if this is just normal kid sleep with extra spice. Has melatonin ever made things worse for your child? What actually worked long term? I’m just so exhausted and I want them to feel rested.