The bed on which you sleep is full of memories. The sounds that swirl around, the light that filters in, the lumpiness or firmness of its cradling round your body, and the scent of the person with whom you share it becomes inextricably linked to that bed itself.
A couple in love graduates from bed to bed as they progress through ever-changing life circumstances. And the memories of those beds contain the memories of all the happy, miserable, beautiful, and strugglesome times that befell them in between all those sleeps.