I am currently getting help with ADD and this is a similar situation to me as well. However, I was diagnosed because I'm trying to get help for insomnia. Specifically, I have a lot of trouble falling asleep. I'm just adding another data point in case anyone is relating to OP, the comment I replied to, AND has difficulty falling asleep. It's always good to have a clear picture of what your mental health is like.
I also had sleep issues, but never bad enough to seek help for them. Fortunately, the ADHD meds fixed the sleep issues, too.
Have you tried taking some L-Tryptophan in the evening? For some people it works wonders for sleep and mood. L-Tryptophan is an essential amino acid that you can buy over-the-counter. Your body needs it to make melatonin and serotonin amongst other things.
My sleeping issues were never bad enough either until my team started having daily 9AM meetings. Ugh
I haven't tried L-Tryptophan! But I'll give it a go. My medication hasn't really started taking effect yet but hopefully I don't have to take sleeping medication once it does. Thanks for the suggestion. :) Hopefully that helps also.