Just wait until the day you spend seventeen hours at the day job, collapse at a hotel for six hours prior to doing it again, and on waking and turning on your Kindle found that you made more while sleeping than you did while working.
That feels... great. Just freaking great. sigh 30 more days.
Well the alternate method surely, is scaling the price you charge for your 'work'.
For example, a live musician won't make money while he sleeps, but if he becomes well known/popular/famous, he can scale up how much he charges for an appearance until he's charging millions and playing Wembley stadium.
Of course that model doesn't really work for us too well and isn't a natural fit business model.
I don't really know what the point of the article was apart from restating what we already know :/
I still remember the morning I woke up to find that my site had finally been added to the Yahoo Directory (Late '99 I think), and I had had 200 visitors!!! already that day, and earned something like $10 from ads. It was a revelation.
Oh, btw, that first morning when you wake up and find out you earned money while you were asleep... feels great.