So the author's reasoning goes like this: you can't sleep because you think of stuff (1), and you think of stuff because you are afraid to forget it (1). I agree partly with (1). It is definitely one a major reason sleep stays away. (2) however is way to general. Waaaaaaaay. Maybe it's true for tha author, but putting it like it's the next big truth is a reason not to be taken seriously by any psychologist. Or by me and probably the major part of HN.