How does a sleep tracker on your finger compare to one in a bed? I tested Sleep Number and Oura for a month to find out. Plus, expert sleep-tracking tips. Aly Lopez Former Writer I Aly Lopez was a ...

Discover how smart rings 2026 track sleep, HRV, and fitness metrics. Compare Oura Ring 4, accuracy rates, battery life, and ...

The following essay is reprinted with permission from The Conversation, an online publication covering the latest research. “Avoid screens before bed” is one of the most common pieces of sleep advice.