You can get CBT for sleep. I have adhd and am a massive night owl plus peri and a stressful job.
Things that are working currently magnesium glycinate 20 mins before bed, a 20 min soak in an Epsom salt bath once a week.
For my brain, I have 2 things. One is to play a version of a word game. Take the alphabet. Start with A. Come up with a 3 letter word. Then B, C etc.
Any word.
Arm, Bog, Cat etc.
When you get to Z, move to 4 letters, then 5 letters. I've never made it to the end of Z with 4 letters before I'm asleep. Really straightens out a jumpy mind.
The other one is to stare really hard at the backs of your eyelids, try and focus on them with eyes shut. I'm always asleep quite quick with that.
For settling my emotions, I might listen to serotonin beats on Spotify, basically any ambient sound for 10 mins.
Breathing exercises can also help a bit. I had a vibrating fit bit that has a breath in and out timed option which used to be helpful.
I also use the phrase 'My Work is done today. I'm putting today's work to rest now because it fuels tomorrow tasks.'
Have a pitch dark room. As cool as possible. Consider a mattress foam topper for comfort. Cotton duvet. Not synthetic. Lowest summer tog all year round. Loop earplugs (although can be a worry if you sleep through and alarm).
Good luck.