If you really want to make money while sleeping, then I would save up the money through selling products online or by giving them away using trialpay, create a product page using weebly slap the product up and manually promote the product on niche specific forums pertaining to the product, save $3,500.00 at the end of the month and then turn around and head over to adwords and drop 1,000.00 and $1,000.00 in payper install. You could make $3,000.00 just from that first $1,000.00 you dropped on payper install. Depending at how good you are at adwords you could bank close to the $3,000.00 from just a thousand by choosing low cost keywords, but no one will ever know, because if I ever did run a campaign for you, you'd probably want to kiss me.
Nevertheless, those are the kind of jobs that allow you to sleep at night, wake up in the morning and check your stats.