Millions of adults miss out on the recommended 7 to 8 hours of shut-eye every night. And over time, that sleep debt can mess with everything from your mood to your immune system. But the good news?

If you use a sleep tracker at night, these are the three metrics you should be paying attention to in the morning.

Sleep has become the new frontier of performance, recovery, and overall health — and wearables have rushed in to promise deeper insight than ever. From rings and watches to bedside sensors and ...

Fitbit has updated its algorithm for more accurate sleep tracking. The new algorithm now accounts for awake times better, supposedly rendering more accurate data about different phases. However, users ...