YOU CAN'T SLEEP ON IT!!!
Firstly, I thought the two fold out cushions were connected/secured but they're not so if you're on a wooden or tiled floor they move. Secondly and most importantly, the two cushions are slightly thinner than the edge of the sofa, so you have a hard edge that sticks right into you. I purchased based on the reviews but I just can't understand how anyone can sleep on it when you have this piece digging into your chest. 
The sofa size is great and the grey fabric looks very nice but I bought this specifically to use for a guest that was arriving and staying with me for two weeks. I just purchased an air mattress as this sofa is NOT designed for sleeping on.