Self-inflating mattress

A mattress support element comprising:

• a fluid-filled bladder, the bladder being sealed to prevent fluid leakage from the bladder;
• a fluid chamber at least partially surrounded by the bladder, the fluid chamber being in fluid communication with ambient air, and
• an elastic member located in the fluid chamber.

A mattress comprising:

• a cover configured to define an interior region;
• and
• a mattress core located in the interior region, the mattress core including a plurality of support elements, the support elements including a fluid filled bladder and a fluid container substantially surrounded by the bladder, the fluid container being in constant fluid communication with ambient fluid outside the bladder, the fluid container being configured to deform from its original shape when an external force is applied to the bladder and to reform to its original shape upon removal of the external force from the bladder to regulate pressure of the support element.