Every year, thousands of children receive treatment for injuries associated with bunk beds. There are so many new styles of bunk beds from which to choose.
Air beds alleviate the problem of camping beds because they can be simply packed in a smaller bag, and then blow an inflatable bed up when you get there. Mattress beds that are too firm will not allow for the natural and essential curvature of the spine. Memory foam toppers can be placed on top of a regular mattress to give it a feel of a real visco elastic mattress, but these are not as thick as regular mattresses and could potentially wear out sooner than a regular mattress.
Let me assure you that these manufacturers know what they're customers demand and thus line the top of their beds with a comfortable, velvet-like material. They allow you to have two beds and a couch all within just a few square feet of floor space. This is likely why the older generation has embraced the change from regular beds over the last several years.
When you read consumer reviews, this helps to take away from the problem, because you can find out how reliable the air bed is without actually seeing one in person. The bottom line in deciding whether a maternity air bed would work for you is to try one, of course.