Have you considered getting a low profile bed? They go down to just a few inches off the floor, and also have the possibility of a bar to prevent falls.
My previous bed was too high to climb into and I suffered an injury, so bought a low profile bed. They are very expensive, especially the 4ft wide ones, but I found one on Gumtree which was just a year old. It was incredibly cheap, but it cost a lot to have it transported to me by the disability people.
It is really very good. I have never fallen out of bed, and am unlikely to now. You should be able to get the normal 3ft wide beds as they are more common. They do raise at the head and foot. They can be raised high to make bedmaking easier.
There are also rails that help you get out of bed, just a foot wide, but high, so that you hold on to it when getting out and in.