With new sharing features, the Health app lets you do just that by offering powerful new ways to stay connected to your loved ones and provide useful information to healthcare providers. REM sleep is where you experience dreaming, and studies show it may play a key role in memory. During the Core phase, your muscle activity decreases and your body temperature drops. You’ll see your data on your watch in the Sleep app, including the amount of time you spent in each stage.
- You can view charts and highlights in the Health app on iPhone and see more detailed information
