How to Earn Money While You Sleep

The idea of "earning money while you sleep" sounds like a pipe dream, but plenty of people do it. It's what's called passive income—money you earn on a regular basis that requires little to no effort to receive it. If Mick Jagger is still earning royalties on "Gimme Shelter," a track that debuted in 1969, every time it plays on TV, that's passive income. Whether the IRS taxes it as passive income is another story, but in the realm of earning money while you sleep, it still fits the bill. Those checks are just rollin' in for Jagger.

So what if you don't have a record deal or if you're not the next Monica Geller? There are actually plenty of ways to earn money while you sleep. In fact, Tim Ferriss, author of The Four-Hour Work Week, has gained much of his notoriety—and wealth—by promoting and using different passive income streams. Read on to learn about some of the most accessible ones.