This is similar to restaurant mystery shoppers, only for hotels instead. Pretending to be a run-of-the-mill guest, you'll go through the entire hotel experience: checking in, checking out, quality of service, amenities, food, and of course – sleeping!
There are two ways to earn money via sleep product testing. The first is to have an online presence (such as a blog or social media profile). In this case, you purchase sleep products, try them out, and then put your findings online. If you gain enough of a following, you could eventually get products sent to you for free.
Eachnight is a company that is all about sleeping. It offers guides on mattresses, bedding, and sleeping. Eachnight also does sleep research and occasionally asks for help from its readers.
Before booking a hotel, most people read through reviews online. As mentioned earlier, hotel or travel bloggers generate a large amount of this content. It could take a while before you have a blog that makes money, but with enough work (and some good shuteye at hotels), you too could earn money from your hotel blog and get paid to nap.