Sargent control panel switched itself off

Hi

Very excited about getting our new (to us) Broadway EB, (2014 model), but, after our first night out we woke up to find that all the lights on the control panel were out. Everything started up again without any problem, but we did notice that the leisure battery reading was lower than previously, which shouldn't have happened, as we were on mains electricity. Is there something we should have done that would have prevented this from happening? Must admit that we found the handbook unhelpful in describing how the control panel works, so we may have overlooked something vital. 
Any suggestions gratefully received, as we don't want to go back to the dealer if its just a simple thing to put right.

Don't they go out automatically after a few minutes - presumably to save power, and for the benefit of those who need total darkness to sleep?

I've never really noticed anything odd in the morning, but that might be me being dozy? 

If it's the same 325 or 328 LED panel like ours, I presume you don't mean that the screen was completely blank???

What model power controller does your van have? Do you have a solar panel?

Might sound simple but was the charger switched on?

The control panels do switch off if you start the engine. Then you have to switch on again. We can advise properly once we know what panel and charged you have. On my 2012 both panel and mains unit are marked EC328. The power unit in the wardrobe won't charge unless it is switched on and showing a red light.

Thanks for all the replies. In answer to the queries:
Our control panel is an EC480 and our power supply unit is an EC 500. 
We don't have a solar panel.
The charger was switched on.
On that particular night, at the time of going to sleep, all three top lights on the control panel were on, as I remember commenting on how bright they were. When we woke up there were no lights on at all. 
Having seen the suggestion that the lights may have gone out automatically to save power, I assumed that was what had happened. However, we've just been away again and this time, even though our end of day routines were exactly the same, the lights on the control panel stayed on all night. 
Not a major problem, but a bit of a puzzle!

Those 3 blue lights should stay on unless you turn off the ec480, the main display turns off automatically. As to why it turned itself off I haven't a clue as it's never happened to me unless I start the engine.