As soon as I unfurled the mattress all corners looked irretrievably sunken. I left it 48 hours and whilst the mattress had puffed out, the corners were still all down and the mattress ramped down on both sides, plus the whole thing looked warped. When sleeping, my head tilted back, I couldn't adjust the pillows in anyway that would make it comfortable, and the duvet was constantly slipping to the foot of the bed as it was so slanted down. What stuck out for me when we tried it in the shop was how level and square it was, so I was perplexed at our version. We got a replacement but no luck, got exactly the same warped mattress, all the same faults. I am at a loss as are Dreams to explain why this is so.