Sleep Tracking & Analysis ← Knowledge Base How can I see my last night's sleep analysis? How does pillow calculate sleep quality? My sleep shows as "Awake" for the whole night when using the Watch. 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? Do I need to calibrate my device? How do I need to place my device during sleep? Does Pillow work with a CPAP machine?