Smart beds and apps that track your sleep could be gathering valuable health data that can be sold to third-parties, experts have warned.
Sleep technology uses sensors to track everything, from when you toss and turn to when you wake up - and they might even be able to tell when you're having sex.
The smart devices are designed to give their users insight into how they sleep and how their heart rate, respiration and movements have changed in the night.
Researchers say they are concerned about what the firms collecting this personal data go on to do with it.
Where this data goes and whether it can be exploited by marketing companies or business partners of the sleep tech firms is still unclear, they say.
Scroll down for video
Smart beds and apps that track your sleep could be gathering health data which is potentially valuable to companies that collect and sell it, experts have warned. Sleep technology tracks when you toss and turn and might even be able to tell when you're having sex (stock)
Sleep aid technology industry is currently booming, with a plethora of companies releasing a host of gadgets and innovations that promote a good night's sleep.
Sleep Number, a company that makes smart beds, collects more than eight billion biometric data points every night.
This is gathered each second and sent via an app through the internet to the company's servers.
'We don't know what happens to all that data,' said Burcu Kilic, director of the digital rights program at Public Citizen, an advocacy group in Washington.
The information 'is also relevant and important to pharmaceutical companies and those that make hospital-related technology,' Mr Kilic said.
This data gives the firm 'the intelligence to be able to continue to feed our algorithms,' CEO Shelly Ibach told attendees at a health conference in San Diego.
Analysing all that personal data, Ibach continued, not only helps consumers learn more about their health, but also aids the company's efforts to make a better product.
The company says it goes to great lengths to protect its customers' data.
'To be clear, Sleep Number does not share any Sleep IQ or biometric' data outside the company, a Sleep Number spokeswoman told San
