Not exactly a product, but...put your directly mattress on the floor.

Does your bed every squeak or rattle when you move around? Does not happen if it's on the floor! Ever fall out of bed? Can't if it's on the floor. Want your bed to be bigger? Throw some pillows and blankets on the floor next to you and sprawl out to your heart's content. This is especially useful if your nocturnal co-pilot has a deeply rooted subconscious obsession with rolling on to your side of the bed.

In the morning, you can literally roll out of bed, and it feels kind of awesome.

Oh, you also now have an arbitrarily large nightstand.

Need to temporarily have more floorspace in your bedroom for something? It's really easy to stand your bed up against a wall.

But the boxspring! Your boxspring doesn't really do anything - it sits 6+ inches beneath you and acts as a solid, flat surface for your mattress. You already have one of those, it's the floor. I've been doing this for years, there is no difference in the sleeping experience except for the above listed benefits, and your view will seem weird for a while but you'l get used to it.

(If other people try this, I'd like to get your feedback so I can figure out whether I should promote this constantly or resign myself to being weird).