Glitch or Weird Thief?

This is neither a glitch nor any weird thief. This is how your device settings have been configured and primarily how you use your device.

There could be a few reasons why your screen time shows overnight use of apps that you have not used in the past few days:

1. Some apps have the ability to refresh their content in the background even when you're not actively using them. This can include downloading updates, fetching new data, or performing other tasks. These activities can contribute to your screen time statistics, even if you haven't directly interacted with the app.
2. Apps can send push notifications to your device, even when you're not actively using them. If you have allowed notifications for certain apps, they can appear on your lock screen or notification center, and this can count as screen time.
3. It's possible that you may have unintentionally opened an app without realizing it, especially if your device is unlocked and easily accessible. Inadvertent touches or swipes could trigger the launch of an app, adding to your screen time.