i've had similar issues with sleeping myself, and i've found oftentimes having something playing in the background will help. Literally anything for my brain to focus on without expending so much energy i'm focusing directly on it. White noise might help, i've found rain and thunderstorms particularly good for that itch. I used to watch yt to fall asleep, and still do on occasion, but that doesn't seem to work as well anymore.
Lately i've been pulling up a yt video and trying to doze off about when it ends, and that seems to work pretty well.
when i'm not doing a variant of that i'm usually doing some sort of pseudo meditation where i actively focus on nothing. That works if i can keep at it. That or not sleeping at all, because my shits fucked up lol.