After a rather nasty and unsuccessful first round of Chemo I lost over 20kg in weight and within a month I was having a rather large operation to remove a tumour from my stomach and oesophagus. Due to the two incidents I had slept more than two hours at a time due to discomfort. We purchased the best device ever in the Alerta Bubble mattress topper, it's the perfect pressure relief EVER and you can sleep with the small motor running with no problem. I've now started to sleep much longer and it has really helped with my recovery. Top Marks from me!