I've updated my phone to IOS10, one of the features I quite like is the bedtime app (and no longer needing a 3rd party app). Whilst the features are pretty easy to figure out I can't seem to figure out... how to turn off the Bedtime app alarm if you wake up before it?

E.g I woke up before the app, left the room, came back and the alarm was going off. Ideally I wanted to stop it before it started.