I’ve been using my M1 with side by side coils on my neck most nights. I find I sleep much more soundly. I believe this is due to less pain in my shoulder area that usually bothers me only at night (it makes me toss and turn).
I’ve rigged up several shirts in an attempt to find a way to keep the coils in place. I settled on using plastic snaps, with sewn sheaths for the coils. There is still the problem of the cables getting “stuck” when I turn over at night. The only “solution” I’ve found is to sandwich the cables/coils between two garments.
The shirt I’m using has the coils attached to the “inside” of the collar. So I usually need an undershirt beneath it to avoid the cables sticking to my skin and perhaps breaking over night if pulled too hard.
I attached a photo of the shirt. There is a hole cut into the breast pocket for the cable to connect through to the M1 itself.
The coils snap off so you can wash the shirt.
You can also move the coils individually to additional points of attachment, as long as the cables still reach the pocket with the M1.
Oh, and I use a “collar extender” (try amazon) so I can button the topmost button without strangling myself! (Keeps the coils snug against the back of my neck).
Hope this helps.