As a kid I developed something that basically is a body scan. I worried about monsters while I was lying in bed. At some point I started imagining a field of green energy starting at the very bottom of my feet and working its way very slowly up each leg, then my torso, down my arms, and finally to the very top of my head. Once I was cloaked in this protective green shield I was safe, as long as I didn't move. It broke if I moved. But if I stayed still I could then inflate it outwards, enveloping my house, neighborhood, city, and eventually the entire world in a protective shield.

I'm skeptical of the idea of a collective unconscious, but still find it an interesting/odd coincidence (and/or weak evidence in favor of a collective unconscious) that I basically developed a body scan practice 35 years before I ever learned anything about meditation, and that it also included a universalist component, enveloping the entire world in protection.

Something similar works for me! Basically purposely dropping into the state of unfocused nonsense that generates dreams

I assume this stuff is highly personal. I have discovered during grad school that trying to do mental research-level calculations in bed makes my brain turn off within a few minutes. YMMV.

Thanks for posting this!  will try it.

The trick that works for me when I have too many things in my head and it’s keeping me from sleeping is to pull out my phone/laptop, and write them all down.  Just stream-of-consciousness. Write everything you can think of, until you run out of things to write.  Pause for a second looking for more things to write and if nothing comes to you, then turn off the phone and go to sleep.

It just clears my head and lets me stop circling.

For me, I notice that my thoughts go in the direction of visual and linguistic nonsense as I drift to sleep. I will think thoughts that (if I wake up a bit more to evaluate them) do not make sense, or make sense but do not correspond to reality. (I have not yet been able to recall examples when fully awake.) Noticing that my thoughts have become nonsense has a tendency to bring me closer to awakeness, but (it seems to me) bending my thoughts in the direction of nonsense on purpose does help me to fall asleep somewhat.

I do wonder if noticing my thoughts shift towards dream-logic might help me to notice rationalization and other cognitive errors while awake.

When I had an acute bout of insomnia, one of the things I found most helpful was listening to sleep-focused bedtime stories. The key part wasn't the sleepy imagery, but rather just having something boring and inconsequential that my mind could latch onto, to replace the busy inner dialog.

I particularly like the stories from the Headspace app—they're slightly randomized each night, which prevents you from using the story progress as a timer ("Oh no, we're up to the skunk already and I'm still not asleep!")

Related: I also found it extremely helpful to get rid of my bedside clock and to use a smart watch for sleep tracking rather than keeping track of my sleep manually. Worrying about sleep makes your sleep worse, and keeping track of how you're doing tends to feed the sleep anxiety.

I battled pretty major insomnia and beat it with "bog-standard" CBT-I. Reflecting, i think there are key useful tricks.
1/ Never toss and turn. Get up and read for 20min. Seriously.
2/ Learn some kind of mindfulness/meditation exercises that you practise when not in bed. Particularly body-scan. I didn't understand why CPT-I pushed this as it seemed counterintuitive, but it trains your brain NOT to notice discomfort/body position.
 

I'm on a self-improvement binge (for about 15 years at this point) and though I don't call myself Christian, to sleep I recite The Lord's Prayer phrase by phrase, meditating on the meaning of each phrase--why it's there, what the intended effect is, whether I agree, and how I might do that thing if I agree. Stressing here that I am not praying: I am considering the meaning of one of the most widespread human mantras in my corner of the world.

If that doesn't work, my next step is to pray (again, I am not Christian--that's not what this is about) that everyone will do the right thing, whatever that is. Sometimes I direct it at current events, sometimes generally.

I think that it's the concentration that puts me to sleep, and the effects on my behavior and attitude are bonus points.

My trick is to focus on bodily sensations and move this focus around.

For example, I will focus on how my arm feels again the pillow. Then I'll start probing details, like how does my palm feel? How does my elbow feel? How does the skin on my knuckles feel? And then I'll zoom out and shift to another major body part. It's kind of like shining a flashlight and refocusing the beam.