We got a sleep number bed for our grandfather and he loves it.  We got to try it at home for 30 days to be sure that he could find the right setting, and he did find one immediately.  After a few weeks, he tried another setting and he continues to make adjustments, just to lay in more ways then one, when he goes to bed at night.  He is not bed-ridden.   This was the right solution for us, and we felt that since the sleep number bed manufacturer was well established and had a good reputation, we could count on this product.  There are other types of these beds, but I don’t know how reliable other brands would be.  If you asked your physician, perhaps there is a way that your grandmother's insurance could pay for some or all of the cost, for  a good brand of bed.  Older people need to be comfortable, and they can’t stay in one position too long without getting sore.  It is easier to get the right bed, then to risk getting those sores, which can be life threatening.  Surf the net to see what is available and ask her doctor for sources, and what or if anything can be done to cover some of the costs. http://www.selectcomfort.com/air_mattress_beds/sleep_number_bed.cfm?mc=402000&cm_mmc.  I also saw this review of adjustable beds and thought that you could check with Consumer Reports to see what beds are the best kinds to purchase. http://www.bedutopia.com/