hehe, i have funny news about this method. my mom has a co-worker that has had insomnia for years. she can’t sleep well. so i told her about this tech and explained carefully what she needs to do. she tried it and thanked me so much xD she said “i had forgotten what it means to sleep like that!!”… so what we said didn’t work on us only 
don’t know about WILDs, but this method does give you very deep and relaxed sleep. you can recommend it to any insomniacs you know