Mattresses that have a point of attachment to an adjustable bed frame that provides a pivot point about which the mattress can pivot when rising to an inclined position. In one embodiment the mattress has a pivoting member extending transversely through the mattress and provides a pivot point about which one portion of the mattress can pivot in relation to another portion of the mattress. By placing the member about midway through the mattress, one half of the mattress can pivot relative to the other half of the mattress, while the center point of the mattress is held in place. By pinning the member to the frame, the center of the mattress is held against the frame even when one portion of the mattress is inclined relative to the other. This prevents or ameliorates the mattress tendency to lift off the frame when the frame pivots into an inclined position.