The invention relates to a posture correction appliance installed in a mattress, comprising a device which generates an alarm for inducing the person sleeping to change their posture from one of supine decubitus to one of lateral decubitus, a linear set (10) of pressure sensors (106) arranged transversely in the mattress below the area supporting the shoulder of the person sleeping, and an electronic control unit (101) for processing the signals emitted by the pressure sensors, determining the posture of the person sleeping, and emitting, as required, a command to actuate the mechanism for generating the alarm for inducing a change in the posture of the person sleeping.
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