Wireless Sensor Networks (WSN) are made up of sensor nodes that are deployed randomly to communicate with the physical world. The sensor nodes are battery equipped which is power confined and difficult to substitute or change. So energy efficiency is a prime need in a wireless sensor network (WSN). To avoid wasting the limited energy, various energy saving schemes are proposed for MAC protocols. Energy efficient MAC can reduce the major energy wastes in the network. Developing such a scheme in MAC protocol has been a hot research area in WSN. In this paper, we discuss need of energy conservation in WSNs. A brief discussion of various energy saving schemes that can be anticipated in MAC protocols in WSN is done.