How would you make this sofa bed comfy to sit on?

[GoddessWhoWalksEarthAsWoman]

This is the perfect dimensions and design but can you suggest how think how to make more comfy since it has no arms.

www.habitat.co.uk/media/catalog/product/cache/1/image/1200x/9df78eab33525d08d6e5fb8d27136e95/4/3/439958_3_1.jpg

I hope this link works....

... Apologies for crap grammar...

Yes to cushions, perhaps bolster type cushions to make them stand up more?