A reformable positioning device providing a user-configurable structure to facilitate customized support and positioning of a subject. The device may comprise a support structure including a support surface having dimensions to accommodate the subject. The support structure may include a resiliently deformable body configured to hold a user-configured shape to position the subject. The resiliently deformable body may be enclosed within and/or otherwise covered by a cover.

A support platform supports a mattress. The support platform includes legs. Force sensors are coupled to the legs or to the support platform. The force sensors are configured to sense a force applied to each leg or support platform. A controller is configured to receive at least one force stream from at least one of the force sensors. The at least one force stream represents a force sensed by the force sensor. The controller is configured to, in responses to receiving the at least one force stream, determine a sleep parameter from the following group of sleep parameters: bed presence, weight, heart rate, respiration rate, and motions. The controller is configured to output at least one or more of those parameters to an end user.