Setting up a bed

We have had Duvalays for some years now & wouldn’t go away without them even though they are bulky.

Best thing ever, expensive, but comes with memory form mattress & snuggle down duvet. We make front lounge into big double bed using all the cushions and simply leave it all in situ, just in case we need a siesta, we have an additional lounge at rear if we need to sit indoors due to weather etc. so all good.

Knee rolls can help stop you rolling off the bunk. 

I had the same problems when we had our two berth Dart - where do the spare cushions go. Ours were stacked in the doorway as well plus there was never really anywhere to put your clothes. Even more cramped than our 6M motorhome.

As Nelliethehooker says, it all depends on the layout.
Ours is 2 berth and tiny. We both have mattress toppers, stored in the space under the bench seats, with sheets stitched into loose covers already in place.
I don't bother turning the seat blocks. There are four back cushions, so two get turned into headboards, the other two stack on the wardrobe. It's a pop-top so the wardrobe doesn't go all the way up :-)
We take off the scatter cushions' outer covers, (made from cheerful charity shop curtains recycled), to reveal the pillows they really are.

But if making it up into a kingsize bed, then yes, I do turn the seat blocks so the joins are more flat, and use the backrests to fill the space. It just takes a lot longer in a very small van to achieve this, it's like doing one of those puzzles where you have one space and all the pieces have to be moved in the right order!