Duty cycling is a technique that has been implemented in medium-access-control protocols to reduce the listening time and minimize energy consumption in wireless sensor networks. This technique manages the active and sleep modes to reduce the energy consumption of the sensor nodes, sending the node to sleep mode more frequently as the energy is drained. Different mechanisms have been proposed to adjust the sleep and active times of the sensor node. One of these mechanisms uses the information from the sensor nodes' battery to adjust its sleeping time. In this work, a novel methodology is proposed to adjust the sleeping time of the sensor nodes based on performance indicators such as the battery state of charge.