All of a sudden my Samsung Galaxy S6 started wishing me "Good Night" and "Good Morning" on an additional lockscreen when I connected or disconnected my charger. The screen also had weather forecast details on it and needed to be swiped away to continue.
Research led me to it being a 'feature' included in the latest update of the Peel Smart Remote App. It is automatically activated by the update with no warning. I feared something had hijacked my phone, and in effect it had. Luckily there is a menu in the top right corner to 'mute' this feature.
Since it is part of the Samsung bloatware that came with the phone it can't be uninstalled, but I have disabled it. Dick move by the App developers.