Can wearables detect heart problems early? Doctor breaks down real data

From tracking sleep and steps to monitoring heart rate, temperature and stress levels, wearable devices like smartwatches and rings are growing in popularity as wellness tools.

Fox News' Brian Kilmeade recently used one of these — an Oura ring — to track his metrics from the early morning hours through a demanding work schedule and reported the results live on "Fox & Friends."

"I just got four hours and one minute [of sleep], but I have some REM sleep, 14%, over 20% of deep sleep.