Growing up Tim Ferriss suffered from "terrible insomnia," and would watch infomercials until 2 or 3 a.m., the author and tech investor said on a recent episode of the NPR podcast "How I Built This" hosted by Guy Roz.

In the 1980s, infomercials selling products or services ran during off-peak television-viewing hours, often in the middle of the night. Ferriss, now 43, "became fascinated by infomercials" and how they worked, he said.