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In wireless sensor networks, densely deployed and resource-constrained sensor nodes observe their surroundings and communicate the sensed data to the sink. However, those observations are correlated - spatially and temporally. Furthermore, the communicated data, depending on their priority, require differentiated QoS, such as end-to-end delay and jitter. In this work, we use context awareness as a means of sharing information required to control the network, and providing differentiated QoS to the nodes and their transmitted data by exploiting spatial and temporal correlation. Simulation results show that context awareness helps nodes to manage the network in an energy-efficient manner.