The history of Sleep devices.
I have slept on duck down mattresses, which are very nice at the start of the night, but all them feathers seem to fly south by the middle of the night.
I have slept on inner spring cotton and it never ended well for those type matresses.
I had a living cotton matress at one time, very nice but to bothersome because to keep it fluffed up ya have to put it out in the sun. ( to much work)
I went the way of the water bed with and without baffles. This was getting close to what I was searching for.
The wife and I went bed shopping and layed on one of them memory foam things. To me, this was a cross between a goose down and a living cotton mattress.
We settled for a select comfort because of the ability to adjust the mattress to what our bodies need on a day by day basis. For me some times the kitchen floor is just the right hardness to sleep on. But that's me. since each side is adjusted seperately the wife gets to sleep in her comfort zone which is on the lower end of the firmness side than my liken.
As we have grown much older now and seem to be feeling the earth's gravity much more. We have added one of them memory foam toppers to the bed. this makes for a good combination.