You can turn off the "Goodnight, Mario!" feature by following the instructions below.
Note: The method is the same for "Goodnight, Yoshi!" in "Hello, Yoshi!"
■ iOS/Android
- Open the app and tap the cog icon in the top-right corner of the screen.
- Tap the images in the order instructed. The settings screen will appear.
- Tap the clock icon in the bottom right.
■ Nintendo Switch/Nintendo Switch 2
- Open the app.
- When Mario's cap is on the bottom part of the screen, press the Left Stick or Right Stick and hold the + Button or − Button for about 2 seconds.
- Select the clock icon in the bottom right.