What is your sleep data trying to tell you? Expert shares 3 key sleep metrics you should pay attention to

Our sleep tech tester testing the Garmin Index Sleep Monitor .

You may track your sleep with one of the best sleep trackers on the market. But unless you understand the nightly data it gives you, you're not going to be able to take action towards improving your sleep health.

Want to track your sleep without the wearables?

(Image credit: Eight Sleep )

The best smart beds and mattresses are lined with sensors that keep tabs on your sleep metrics without you having to wear any watch, ring, headband or armband