No idea if it's replicable, but I found that the only thing that ensured my sleep when I was at the stage you are at was to drink tea brewed on fresh oregano le

No idea if it's replicable, but I found that the only thing that ensured my sleep when I was at the stage you are at was to drink tea brewed on fresh oregano leaves (I have them in my garden), mixed with honey. It's something I'd never done before, but it put me to sleep in minutes and let me actually rest.