For years I have tried to figure out ways to make money while i was asleep. Things I have considered.
1. Vending machines- not as easy as it sounds. startup money is not great, but volume is required in order to compete with competiton, labor, theft, vandalism and the like. The greatest barrier to entry is the real estate. you know location, location, location. what is in it for the owner of the land can make or break your profitability.
2. Apartment ownership- greatest barrier to entry, down payment money. a great investment for the right person.
3. Giving to charity/church- this has been the most rewarding as in life you must believe that what you give is what you get. so when you give good, dont think money, but good that is what you get. Giving $100 to Red Cross may not bring you back $200 in cash, but when you get that 1st class upgrade on your cross country flight, that is your return, good for good.
With this in mind, I have been spending so much time learning the ends and outs of commission junction and search engine optimization. My buddy at NYCMoney has inspired me so much. Read this post for more information. But in short, this will not get you rich quick, however any goal you can set, AND FOLLOW THROUGH with, you can make good money.