How long does it take to break in?

Allow two to three weeks. The comfort foams relax slightly as they conform to you, and sleepers coming off a soft or worn-out bed often feel this mattress as firm at first before it settles. The 884-coil core and 2-inch support foam do not soften, so the change you feel is the surface settling, not the support giving way. Sleeping on it nightly through the adjustment gives the truest read of the feel.