powerful guidance

like the book very much!
It helps answer some questions plaguing me after I finished reading 《高效人士四小时熟睡法》，and provides some useful tips which are much easier to apply on a daily basis, for example, get enough sunshine, exercises and take day-time naps limited to 45 minutes.
Anyone interested in the English version can get access to it via the internet. Hope u can benefit from the book too.