Insights, category: Company

Our newest app version takes a big leap forward on that mission, delivering more real-time insight, cleaner data, and a brand-new Body Readiness feature you’ll want to check every morning.

Deep sleep, also known as slow-wave sleep or NREM Stage 3, is the heavy-duty restoration phase of your sleep cycle. It’s when your body goes into full-on repair mode—muscles rebuild, tissues grow, your immune system gets stronger, and your brain cleans out waste.