If you are not on any brain altering medication (or other drugs), try chamomile tea before bed time. Please read up on the chemical profile of chamomile tea as it will interact with certain brain medications (start here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2995283/).

Reducing artificial light after sundown and cutting out caffeine and listening to slow placed instrumental music (key being that there are no vocals/lyrics for the brain to attach to) has fixed my "awake brain" issue. Try to also avoid screen time before and in bed as each "new" thing you see (lets say, hackernews post titles) will activate your brain for a few minutes and keep it awake long after it has seen them. I use a single tea candle and switch off all other sources of light - it emits more than enough light! Basically you want to try to limit any inputs and have a consistent winding down ritual.

After a while the brain will accept this new ritual and will immediately get into a relaxed state if the lights go down and it hears a certain pace of music. For me, hang drum + flute music is the best, followed by calm asian instruments. When you listen to the same calm playlist over and over at bedtime, eventually you will know them. When you get to this stage, the brain will get bored with them at first - then you can double down and hum with the song (if you live alone of coarse). Try not to "talk" to yourself internally during your winding down ritual as it will keep the brain awake (don't try to convince the brain it is time to sleep, it will resist and fight back with more awareness).

Do this for 2 weeks and see if your night ritual improves. Obviously adjust it for your circumstances. Make it your special me-time. Choose the music to be unique and don't play those songs at other times. If you brain really wants to have a chat, ask it how it's been, tell it you are thankful for it and you will see it again in the morning! Make it your friend, don't fight it. I mean it. Be gentle and caring towards it, like you are it's father/mother, accept it for what it is.

The whole ritual last from 20 to 60 minutes, depending on how tired you are and how much conflict you accumulated during the day (conflicts being work frustrations, traffic frustrations, sexual frustration, doing things against your ideal solution, politics/news). These things all put pressure on the internal state and most people relieve those pressures either by sexual release, exercise or drugs/alcohol/food before bed. Having a self care ritual is another option. Sleep will do most of the work for us, but sleep is so much better if is not forced but rather gently simmered in. Fresh bed sheets & hot shower can also affect how comfortable the bed feels. A good mattress also helps. Natural smells also helps, so a drop of rose geranium, rubbed on your skin. Again, if you pick a specific flavour/smell to make part of your ritual, use it only during your winding time ritual and not during the day. You want to let the brain associate the music and smells and other environmental factors with "time to relax mode". Be consistent.

The thing that disturbs my peace the easiest is caffeine, even a single cup in the morning can effect my night time ritual.

Anyway. The above kind of what works for me, it's not medical/scientific based, hope it helps. Self care goes a long way!