Another solution I found is to put on top of a large pads breastfeeding pillow those bent on "u" inverted, with the curve upward to support the head and the tips of the "u" down, but arranging them in order to better support the spine.

Opt for a medical bed (in separate mattresses for those who are married), is a very expensive but it proves effective solution that we can climb the headboard to the sitting position. When failure is that the light is a problem.