Lockscreen does not unlock on alarm (Samsung)

Issue: When alarm goes off, it does not disable the lockscreen and you have to manually unlock the device to tap snooze or dismiss.

Explanation: You may have Sleep as Android enabled under Border lights. This causes the alarm popup to not display over the lockscreen, as the notification is being shown as a light around the edge of the screen.

Solution: Disable Border lights for Sleep as Android in your device’s settings.