Sleep Trackers: How Do Devices Stack Up in a Lab?

Stanford University’s sleep clinic compared three of the most popular sleep gadgets.
2:51 | 01/20/15

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Transcript for Sleep Trackers: How Do Devices Stack Up in a Lab?
"Gma" investigates and this morning on the joan da sleep tracking devices which are so popular now. You know the ones. They give you the data on your sleep patterns to help you get a better night's rest. How do they compare to a sleep clinic. Becky Worley took a snooze to find out. Reporter: Sleep tracking devices are flooding the market. But can gadgets that cost less than $200 give you information that's accurate enough to really improve your Zs? "Gma investigates" choosing three of the most popular devices and taking them to the Stanford university sleep clinic where I'll spend the night as its sophisticated medical devices measure my sleep. I feel like a character from the "Star wars" plus. It goes next to the bed wirelessly sensing my sleep. Jawbone are fitness trackers worn on the wrist. I sleep pretty well considering how weird I feel. Ready to get up? Good morning. So how does the data from the consumer devices compare to the clinic's report. I thought I slept well. Actually you did sleep really well. How much did I get? I got 7:34 of total sleep. The S plus is closest at 7:41. The jawbone, 8:01 but the basis added 48 extra minutes of time. The mainers of the basis say an independent study showed the device was 90% accurate on nine out of ten nights compared to a medical grade sleep study. Next how many times did I wake up? Stanford says I had 25 wake events, the SPLUS says four wake-ups, jawbone says one and basis zero. According to this doctor Stanford detects waking through brain activity and says that's not always the case with consumer devices. A lot might measure by movement. Reporter: And some like the basis use heart rate so if you wake but you don't really move it may not register. Now these devices also report data on R.E.M. Sleep, deep sleep and one counts how often you toss and turn, none of the companies claim these are medical grade devices but they do say over time that data can point to a trend. Looking at it on a single night basis might not be that accurate but if you're looking at it say over the course of a month and you notice that you're getting more sleep or less sleep, that might be something that in turn might encourage you to change your lifestyle. Reporter: While these devices make you aware of patterns they can't diagnose a sleep disorder and any one night's data shouldn't make you lose sleep. For "Good morning America," Becky Worley, ABC news, Palo alto, California in I don't know about you guys, but I need a

This transcript has been automatically generated and may not be 100% accurate.

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