"Yoga Nidra" (or guided meditation, which is really what that is) helps them to sleep. Hearing the sound of someone's voice would do the exact opposite for me...
True, true, for me too, would you believe! Most voices, sounds of nature or gentle music, guided meditation types etc. irritate me greatly, so much that after 5 or so minutes I feel like throwing the medium out of the window or breaking it.
I had to search a lot to find the right type. Thing is as I couldn't sleep anyway, then I might as well try some relaxation forms myself or guided which do me good, even if it doesn't send me to sleep. Also it distracts from my brain chatter, so is better than getting excited or strained by some idea, that's fatal and happens to me all the time. Darkness and quiet around me is a prerequisite for me too. But that alone, or doing any relaxation myself hardly helps me.
So one the advantage of NSDR (NON-sleep) is it can substitute sleep, if nothing helps. Perhaps to full-time Zen monks being able to sleep less when they're meditating most of the day.
Next good thing is you can choose how long it is. Even the 1h Ally Boothroyd one for insomnia fades away and the last 20 minutes or so is mainly quiet white noise - like waves. Before that she sometimes says one more thing gently, and that may wake me up again, but that matters less than my own chattering thoughts, so the voice brings me back to listening to my body or beautiful still images. If I realize I'm dropping off I turn it off. Now I use shorter ones 10 or 20'. On bad days I used 1.5h, cos I knew I wasn't gonna get to sleep easily anyway.
Ally Boothroyd is absolutely the only voice that after getting used to it and getting better sleep does now always make me nod off inside of a few minutes.
This is why I said this is good for people who can't get to sleep anyway, even if (they think) they've tackled all their insomnia triggers and tried all the >10 supps etc.
I agree fully that Yoga Nidra is a misleading term, cos it's modern adaptations of relaxation techniques that are used.
However I think "guided meditation" is usually not meant to send you into a sleep-like state or even sleep itself.
So it is a specific form of one. That's why I use the term NSDR, and only yoga nidra so people can find it and realize that it's a relaxation form.
light blocking curtains on my bedroom window and am fortunate enough to live in a rural area that is very quiet most of the time,
I would have thought everyone tries this first, if possible? Blackout blinds I still use and earplugs I needed for years, esp. cos of noisy old slightly deaf neighbours above and below: my bed is exactly between their two TVs, and the one above likes stomping around at 5 in the morning... If I want to go to bed a bit earlier and their TVs are blasting, a broomstick or jumping on the floor hardly helps, just makes me nervous - so again NSDR blends over that.
These are just a few of my 30 triggers....
But even after I'd solved all of these and there being seemingly no reason: often no sleep. So....