I can actually confirm this -- my father served in WWII (but in the Army), and he came back with this skill to fall asleep quickly. I, sadly, don't really have

I can actually confirm this -- my father served in WWII (but in the Army), and he came back with this skill to fall asleep quickly. I, sadly, don't really have it. But this article has given me the idea to work on it more. The relaxation ideas here, of course, come from Indian yoga techniques, but maybe they didn't mention the history of it when teaching it. Now that would be a selling point, ha!