Sleep mode used to be disabled when energy saving was off and always connected was off.
But in one of the recent releases they changed that. On page 62 of the latest owners manual, "OFF. Model S shifts to the energy-saving mode at night (10PM to 5AM)".
So OFF is no longer OFF - it is really OVERNIGHT. They really need to add an "OFF" that turns sleep mode completely off. In most cases, when people have their cars plugged in overnight, enabling sleep mode doesn't produce that much energy savings - so why have the car turn off?
Since first implementing sleep mode 3 years ago, Tesla has had problems, especially with the media player app, when the car resumes from sleep. And the easy fix has been to disable sleep mode completely.
But they broke that in the recent releases (6.2?) - which is why many people were reporting the audio system running by itself overnight and discovering that their USB music had positioned to different songs when they started the car in the morning. And for the people who were using USB to play audiobooks - wanting to stay at the same position in their audio file, there wasn't any way to work around this problem.
It's changes like this and other changes like the placement of time/temperature or removing the audio source selector which raises into question how much review is being done by these changes - before they are released.
TESLA - please change OFF to OVERNIGHT and add a real OFF for the energy saving feature...