Experts Question Reliability of Sleep Trackers

Lots of people use smartwatches and other gadgets to track their sleep.

These devices measure things like your heart rate and movement to guess how well you're sleeping.

Experts say they're pretty good at telling when you're asleep, but not as accurate as special lab tests for figuring out different types of sleep.

Some doctors think these trackers can help people see sleep patterns over time, but they shouldn't worry too much about one night's results.

The devices can help people improve their sleep habits, like going to bed earlier or not drinking alcohol.

But for some people, focusing too much on their sleep scores can cause stress.

Scientists are working on ways these devices could help detect health problems in the future, like infections or depression.