This type of income is rare, because it means that you need to make more income than what you are spending. I mean you need large capital which is only possible when you earn more and save more and then you make your capital working for you without any flaw.
For example, this month I have about 300 dollars that I need to live with, maybe a bit more than that, its really nothing much, its a little over half of minimum wage here, does that mean I would be able to do something that could make me money while I sleep? Of course not, by 15th of this month or before, all of this money will be gone, I will not make a dime from it, and people think that you could just live with that.
I think the crazier thing is that even if you make thousands, life isn't that simple, you expand your life, so even if I made 10k per month, first few years would all still be debt, because you expand, you start living a higher standard, and THEN you start to save some.
Money is very good in our lives. You will enjoy life more, even though life is not easy, when money is earned in a very easy way, you use your money to earn more money. That's, this type of money is perfectly earned when you allow your money to work for you. But when you are the one working for your money, you can not be able to earn this kind of money.
When we work for our money, our income becomes limited and it comes in a fixed amount. This is because when you are sleeping, your money stops coming when you are the one working for your money. But when you make your money works for you, you can be sleeping, you can be doing anything you want to do at anywhere and the money would be working for you.