Best sleep meds for withdrawal?

I’m going to a doctor who deals with addiction. I am gonna do the vit C regimen and have a bottle of Gabapentin from a friend that I’m gonna use for the jump. If I could get any sleep meds for a couple weeks from this doctor, what is the best option? Something that doesn’t add to the withdrawal symptoms and something that will really knock me out. Sleep is the hardest part in my previous experience. Fwiw I’m on 6 capsules a day right now. I know it doesn’t seem like a lot, but it’s been a while. Any sleep med recommendations would be greatly appreciated