mine is hypnos and very heavy, discontinued now but pricey even then and worth looking after. We had two new single beds next to each other, just 3 months before my husband died. I kept the two beds since then and still next to each other
That second bed is very useful to enable mattress turning or flipping. I am supposed to do this every quarter and so far so good, 5 years on and I am still managing it. Three things made it easier for me, I put a big number 1-4 on each end of each mattress, so I know which end/side is next under my head, singles are obviously easier and the spare bed stops the mattress bending over the bed while shifting it
I cannot see me ever having to buy another mattress, the one I sleep on is even and in very nice condition and in five years I shall swap that one with the second bed mattress. I intend to keep turning/flipping, good weight training