The bed and mattress industry is a huge part of the sleep market.  It's not a huge surprise, seeing as they are such an essential part of any household.  The sleep environment plays a huge part in the amount and quality of sleep you get.  This includes the quality of the mattresses you lie on.

Many companies create and sell different kinds of beds and mattresses, and as with any other industry, most of them would hire someone to test out their products before they roll them out in the market. 

Quality Analyst Testers at Mattress Firm reportedly earn an average of $98,434. Of course, you may be required to do more things than just sleep, like creating reports to document your experience, but testing out mattresses is a definite perk of the job.

Sleep Junkie has also provided opportunities for professional sleepers. Last June, they paid someone $3,000 to test out one of their new mattresses. Pretty sweet compensation for a nap.

We know that sleep is important for overall health.  Like computers, our bodies need to recharge at the end of the day.  However, there are still many areas of sleep that remain a mystery to science, so there is plenty of ongoing research in this field.  With that, there is plenty of opportunity for someone who wants to be a research subject.

We know that sleep is important for overall health.  Like computers, our bodies need to recharge at the end of the day.  However, there are still many areas of sleep that remain a mystery to science, so there is plenty of ongoing research in this field.  With that, there is plenty of opportunity for someone who wants to be a research subject.

Harvard Medical School

Harvard Medical School Division of Sleep has plenty of faculty researching human subjects.  You just hop to their site and browse through the studies like you're at the mall, then you can go ahead and contact the person involved.  Of course, each study has different requirements to be met by participants so it's never going to be the same experience, but we're sure it's going to be fun.

You can visit their complete list of sleep research studies at Rally

Project Sleep

Project Sleep is a non-profit organization dedicated to spreading awareness on sleep health and disorders.  Along the way, they collect information on ongoing sleep research studies, and on their website, you may be able to find a suitable study you can participate in. 

ClinicalTrials.Gov

This is a database for publicly and privately funded clinical trials, a resource provided by the U.S. National Library of Medicine.  Here you can find recruiting studies about sleep (and other areas) that you may be able to participate in.

Feinberg School of Medicine

Feinberg School of Medicine is a part of Northwestern University.  The Center for Circadian & Sleep Medicine has ongoing sleep studies that are actively recruiting participants.  You may go to their site or check them out at clinicaltrials.gov to find out if there's an ongoing study that will suit you.

Center Watch

Center Watch is a database of clinical trials where you can find and select active studies to participate in.  You can sign up as a volunteer for sleep research, although some of these trials don't pay.  Still, you may be able to access a study that pays to participate if you search hard enough. 

Institute of Translational Health Sciences

The Institute for Translational Health Sciences is also actively looking for participants for ongoing sleep research studies.  Most of them pertain to sleep disorders, so you may not be able to apply if you don't have one, but it's still worth looking around.

Aside from universities and organizations conducting studies, you may also participate in private studies being conducted by sleep companies.  The following companies have open positions that will pay you to take naps.

Eachnight

Eachnight opened recruitment for five lucky persons whom they dubbed as Nap Reviewers who will be paid $1500 to take naps.  You only need some English skills and the eagerness to nap every day for thirty days.  The idea is to test how different length naps have different benefits, and at $1500 it's a real huge benefit to you as well.

Sleep Standards

Sleep Standards is willing to offer a pretty generous compensation package to their self-assigned guinea pigs. The company is currently researching the influence of environmental factors on the quality of sleep. Subjects will sleep in five different sleep environments for the duration of the study. All they need to do in exchange for a hefty $2000 is go to sleep and write an honest report about the experience.  Oh, and did we mention all expenses are covered by the company?

Wakefit

Wakefit is searching for a lucky sleep intern who can and will be able to sleep through just about anything.  If selected all you have to do is sleep for 9 hours every night for 10o nights.  Sounds like easy money to you?  You can apply at their website.

Setting up a blog or website dedicated to reviews has their perks.  Film blogs often get free screenings to give honest reviews on upcoming films, while successful food bloggers may be invited out for a free meal by restaurants looking to put their name out there. 

In the same way, hotel bloggers can be invited to sleep in a hotel for free in exchange for honest reviews.  You can set up your own blog, build up a reputation, and leverage it to get paid for every review you write. If you get big enough, chances are hotels will start seeking you out. 

According to Business insider, Review Stream pays you $1.50 per review.  Review Stream is a cooperative website that allows you to post and get paid for each review you write.  Of course, your hotel stay will likely cost way beyond that, but cash is cash. 

Trivago also pays for reviews through the quality test program.  The program isn't open year-round, and at most, they would pay for one review a month.  You will also need to pay for your hotel stay, so you're not going to be a millionaire doing this.  But you can reportedly earn up to $120, so there's no reason not to try.