Pocket Spring Mattresses consist of a grid of springs, each in their own fabric pocket. Because they're not wired together, each spring is able to work more or less independently, The weight on one spring doesn't affect those surrounding it, (Hence if your partner wakes up in the middle of the night the spring tension does not affect your sleep). Also a pocket-spring mattresses is considered the most comfortable type of inner-spring mattress The springs in a Pocketed Spring Mattress being individual in nature also avoid partner discomfort and disturbances.