Hi can you sleep children in the awning i haven't got a ground sheet, ive looked at tents you can attach to awning, also do you keep the camper open so you no kids are ok? Advice please no idea.
My 14 year old daughter and her friend slept in an inner tent in our awning, I put a groundsheet underneath it. We didn't leave the door of our camper open because we have a dog. Some people like to use pop up tents in the awning.
However, they could sleep in the awning ... how you achieve that will depend a lot on personal preference and weather conditions (especially temperature).
A ground sheet will protect from damp ... but if they are on (say) an inflatable or camp beds ... they will be well off the ground.
A good duvet or correct tog sleeping bag, will also provide decent protection.
Having the connecting door open is really a question of whether the children want/need that sort of potential contact .. I'd play it by ear.
You can get a zip in awning annexe/pod for sleeping in ... can get a lining and built in ground sheet.
Ours, eventually moved out into a small Quechua so as to distance themselves from parental encroachments!