Sleep trackers might be inaccurate, and there’s a stunning lack of testing and analysis on the topic. This research paper offers an summary of a number of the analysis, and there have been some small studies, like this study in San Diego and this study in Nebraska that in contrast some commercially out there trackers with polysomnography (PSG), which is the gold normal sleep research methodology (it data brainwaves, coronary heart price, blood oxygen stage, respiration, and motion).
You would possibly moderately anticipate sleep trackers with extra sensors, able to recording comparable information to PSG, to be extra correct, however producers additionally develop their very own set of proprietary algorithms to interpret the info. With PSG, the info is interpreted by a well being care skilled.
Some sleep know-how firms have funded analysis. We spoke with Tyler Lee, Asleep cofounder, about some analysis they plan to present at the World Sleep conference this yr. They labored with Stanford and Seoul National University Bundang Hospital on a joint research that in contrast 11 sleep trackers towards PSG. The research examined sleep stage measurement and accuracy in measuring sleep effectivity and latency. The outcomes had been attention-grabbing.
The research had 75 participants and was conducted independently in Korea. It in contrast the Pixel Watch, Galaxy Watch 5, Fitbit Sense 2, Apple Watch 8, Oura Ring 3, Withings Sleep Mat, Google Nest Hub 2, and Amazon Halo Rise. It additionally included three apps: SleepRoutine, SleepRating, and Pillow.
Scores had been combined, however the Pixel Watch, Galaxy Watch 5, and Amazon Halo Rise carried out effectively at measuring sleep phases, whereas the Oura Ring and Apple Watch had been higher at measuring sleep effectivity (time in mattress spent sleeping) and sleep latency (time to go to sleep). The total winner was Asleep’s SleepRoutine app, which applies an algorithm to respiration sound. (We are testing the app for a future replace, so keep tuned. We’re additionally testing the Pixel Watch 2.)
The huge losers of the research had been the opposite two apps, SleepRating (ultrasound reflection) and Pillow (accelerometer). The Google Nest Hub 2 was additionally persistently poor, which tallies with our personal testing, and the Withings Sleep Mat proved surprisingly dangerous at figuring out sleep phases however did fairly effectively with sleep effectivity.