I started having breathing problems when I was lying down, and was spending a lot of time sleeping in my recliner. Piling up a bunch of pillows on the waterbed wasn't doing a very good job of propping me up to a comfortable breathing position.
So I bought an electric (mechanical/adjustable) bed. Much fancier than a hospital bed, but the same idea. It has massage, which is an interesting sensation, and the cat seems to enjoy it. But, no heat. Also, even though I adjusted the head, the recliner was still more comfortable when I was having trouble breathing.
Besides, every time I turned over, there was a cold spot, and my feet were always cold.
A friend told me she always had flannel sheets on her bed in the winter time, so when I saw an ad that one of the stores was having a sale on flannel sheet sets, I thought "Oh, what the heck. Let's give it a try." Wow! what a difference. Flannel sheets are ever so much warmer than ordinary cotton sheets. I slept very snugly last night, and my feet were warm.
But I still can't adjust the bed for comfort when I can't breathe.
Oh, well. I guess you can't have everything.
Night-night, all.