Jim Donovan explains
Rhythm as a way to calm yourself to sleep works — I discovered something similar many years ago.
He gives instruction on how he does it, and anyone who fights with sleep should try it.
But the key learning here is anything that helps you get out of your head and fall into any kind of peaceful, focused, rhytmic state will probably work.
That's what it's all about, turning off your brain and feeling the natural rhythm of your physical body and especially your breathing.
I will explain my method in a future post.