Luckily, my mattress has no springs.
Its a solid block-o-foam.
...though the fact that the frame is made of metal is disconcerting D:
I never understood why people could stand sleeping on a thin piece of cloth supported by springs that could easily rupture the cloth and IMPALE YOU WHILE YOU SLEEP. A solid block of foam will never do that!
EDIT: Oh wait foam might be carcinogenic too. ****. But the spring-impalement concern stands :<