My daughter slept on a very similar chair at her grandparents house when she was growing up.  She suggested getting the same for our house.  Wayfair was the only one that had these.  The grandkids love them.  They take up very little room when folded and of course function as big cushions.  They also don't use much room when fully open - a great plus for small spaces.  

Twin size sheets almost fit - just a little bit too big.   Only con, is that they are a bit narrow for kids that roll over a lot while they sleep.