Hi, does anyone know if a lack of deep sleep could be related to sleep apnea? I've been using a sleep app that's been tracking my sleep. And it shows that my sleep debt range varies A LOT in one night. It can be completely normal (7.3), and then it somehow falls to -1.5 during the night. It's really strange, and I've never had a problem with deep sleep before. The reason why I decided to use the app is because I'm very tired during the day.