Sleep tracker feature update request

I've noticed that with the sleep tracker if you don't hit save right after you hit wakes up, and your screen turns off or you exit the app, that the time you were tracking is gone. This is very frustrating as having an infant doesn't always allow me to hit save immediately. If that could be fixed, I would so appreciate it! This app is awesome and this is my only complaint. I am using the app on android with a Samsung Galaxy Note 5.