A writer for CNET evaluates all the sleep tracking features on the recently released Fitbit Charge 4.

Each morning, the Fitbit app gives you a Sleep Score based on everything from sleep duration to sleep stages, heart rate and variations in blood oxygen levels, aka SPO2. 

After a few nights of testing, it’s actually provided some useful data about my sleep habits. For starters, I’ve gotten a passing grade (above a 60) every single night, despite waking up to nurse my little one. The app told me it’s normal to spend up to 45 minutes awake each night, which was comforting. It also gives you advice on how to improve your score, like keeping your bedtime consistent, regardless of how late (or early) it is. 

Everyone can see basic information in the app, like how much sleep you get and its quality, but Fitbit Premium subscribers get access to heart rate and blood oxygen data. I didn’t see anything out of the ordinary in my chart, but I can see this feature being extremely helpful for people who suspect they might have a more serious sleep-related condition like sleep apnea. In that case it might be worth the extra $9.99 (£8.99, AU$15.49) a month for a premium account. 

There is one foreseeable downside: With all this sleep data I worry that I might become dependent on the Sleep Score to feel energized during the day. That is, a low Sleep Score may subconsciously make me feel tired, even though I felt like I got a good night’s rest. 

Get the full story at cnet.com.