Notification permissions in Android settings

Device Settings > Notifications > App notifications > Drunkenstein

Allow "Do not disturb" notifications in Android settings

Device Settings > Notifications > Do not disturb > App notifications > Add App > Drunkenstein

Notifications are sometimes delayed

This can happen if battery settings for Drunkenstein are set to optimized or restricted, please set it to "unrestricted". This can also happen if the app is on a deep sleep list, or you might have a memory/battery manager app restricting Drunkenstein. This can result in Drunkenstein notifications first being delivered when you unlock your phone, and you might get a bunch of notifications that was all delayed

You can find more info here on troubleshooting delayed notifications link