Sleep Tracking & Analysis ← Knowledge Base How can I see my last night's sleep analysis? Can Pillow track my sleep automatically? How does Pillow calculate REM sleep? How does pillow calculate sleep quality? My sleep shows as "Awake" for the whole night when using the Watch. What do the indicators (arrows) next to sleep quality mean? My sleep sessions shows only "Awake" time. Why? I woke up and the daily report shows "no data recorded". What's happening? My Apple Watch is showing that a session is active on the phone, but it is not. What should I do? Will notifications, texts and calls go through while Pillow is active? Do I need to calibrate my device? How do I need to place my device during sleep? Does Pillow work with a CPAP machine?