This is quite confusing and I really wish Apple would somehow clear this up to make it easier to understand. But there's 2 ways to setup bedtime mode. You can either do it through settings or through the clocks.app.
Doing it through the clocks.app will give you more features, such as setting the days you want it on/off, and being able to set a special alarm sound that slowly gets louder as it plays. Will automatically notify you when you need to go to bed.
But if you enable bedtime mode under settings, you get none of these features. It just simply turns on or off depending on the schedule time range that you have defined but DND mode.
Doing it through the clocks.app will give you more features, such as setting the days you want it on/off, and being able to set a special alarm sound that slowly gets louder as it plays. Will automatically notify you when you need to go to bed.
But if you enable bedtime mode under settings, you get none of these features. It just simply turns on or off depending on the schedule time range that you have defined but DND mode.