Have you ever woken up from a night full of vivid dreams and unexpectedly felt more rested than usual? You were likely experiencing something more than just rest. That deep, dreamy sleep is called REM sleep, and new research shows it might do a lot more for your health than we thought. What the Study Found Researchers analyzed real world sleep data from nearly 96,000 adults. They used wrist devices that tracked real sleep patterns, not just what people remembered about their