save separated files as artboard in 1 illustrator file

hello

I work on surface in drawing session. I have no time beetween each pose of 5 or 10mn so i save each drawing as auto untitled1 and 2 and so on. I prefer to have 1 file at each time because being in a rush i see better and can manage easier my layers : a surface pro is a tiny thing. but at the end i have plus 20 files I would like to resume as as much artboards but in 1 file for having a global view of my session. i do all that stuff manualy after... is there a trick? experience in managing such situation is welcome too

merci a lot in your general direction