I drape my CPAP hose over my headboard at night. After adding a hose cozy, I found that it would slip back down and then tug at my mask waking me up. So I made this clip on ring that would prevent it from sliding back down. What I've found is that it probably works best if your headboard is close enough to the wall so that this retainer can't slip between the gap when attached to the hose.
This one honestly might just be a thing that's useful for me, but I figured I'd share it anyway.
The author marked this model as their own original creation.