The relaxation method in the article requires physical comfort, which isn't always available. I used to lie awake for hours when I was younger; now I can fall asleep quickly in all places (bus seats, desk chair, etc). What changed?

I ride a bicycle. That fixed my blood circulation, so I don't get cold feet.

I also read the Bible and pray. It's very easy to fall asleep in church on a hard wooden pew. The same approach works at bedtime.

Sleeping less once a week (CouchSurfing meetup from 9 pm to 1 am on Wednesdays) builds sleep debt. That increases my emotional extremes, but the prayer handles the low points, so I end up happier. It also makes me pretty tired, so I'm able to sleep more easily on Thursday & Friday.