The first is to play the 'unrelated words' game, where you think of a word as completely unrelated to the last word as possible.
The second is to count up and work out whether the current number is prime.
Both occupy the mind while minimizing stress, allowing the body to relax into sleep.
I'm definitely going to try the techniques in the article though.
This also made me think of Feynman's sleep experiments:
https://www.reddit.com/r/LucidDreaming/comments/1p1107/richa...