This one is still on: https://www.supermemo.com/articles/sleep.htm https://www.supermemo.com/articles/sleep.htm Seems interesting but I have to say it is too l

This one is still on: https://www.supermemo.com/articles/sleep.htm https://www.supermemo.com/articles/sleep.htm Seems interesting but I have to say it is too long to read it now. Too bad the pdf download redirect directly to the suspended account.