'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.
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.'
Read more: Smart beds and sleep apps are gathering data that could wind up in the hands of marketing firms, experts warn - and they might even be able to tell when you're having SEX
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