@peatyzilian
If you dig into Peat's newsletters with w search tool (impossible if you don't use a text search tool), you will find a lot on serotonin-
The gut produces plenty if not most of the endogenous serotonin from gut bacteria.
The lungs deactivate most of the serotonin in your body.
The platelets transport serotonin to the lungs as long as there is enough carbon dioxide in blood. Otherwise serotonin is free and the more likely it gets into your brain.
So:
It helps to lower your gut bacteria so it isn't teeming with too much bacteria, however balanced your gut micro biome is. This goes without saying that a balanced gut micro biome is better as it keeps no form of microbe from being dominant.
It helps to have enough CO2 in your body. The best way to that is to have good mitochondrial oxidation where sugar is metabolized aerobically making full use of the mitochondria to produce energy and carbon dioxide.
In case you know you're not producing enough CO2, increasing your CO2 intake directly or indirectly will assist your body in meeting your need for more CO2. This can be done by breathing carbogen or drinking carbonated water or taking in baking soda. This may be something you have to do regularly. The dosage and frequency depends on your context. Testing your acid base balance helps. I test my acis base balance daily and it isn't difficult to do. It takes a while to explain, but I'd you're serious about doing it, I will take the time to explain it.
If your lungs or breathing is ailing, chances are you will have difficulty with sleeping, as your lungs' inability to breathe well affects your ability to deactivate serotonin.
If your metabolism and ability to produce CO2 endogenously is fine, and your lungs are letting you breathe well, be may be deficient in zinc and copper as these are important in the body producing enough SOD (superoxide dismutase) needed to deactivate serotonin ( I think zinc is what's needed but it could be copper). Needless. to say, having enough platelets as well as CO2 to being serotonin to the lungs for deactivation is needed.
The other substances mentioned already by other members would tide you by, but longer term you don't want to be dependent on these drugs. You already know that though, as you make quite clear at the start.
I had sleepless nights when I had bronchitis. I have Cypro but it could be that I'm too skittish in using more than four drops of it a day, so I may be guilty of underdosing. But with the use of antibiotics and with nebulization, together with sleeping with carbogen, eventually my lungs started breathing better , and with that I got better sleep.
With all issues gone now and with me back to a regular state of optimal sugar metabolism, confirmed by optimal acid base balance and optimal blood sugar regulation (stable and normal blood sugar all day and night), my sleep now is long and restful. Though I could do some more work on the waking up to pee bit.