Internet-of-Things (IoT) refers to the massive network interconnection of objects often equipped with ubiquitous intelligence employed to provide smart services to end users. However, one of the substantial issues of IoT is the limited energy of IoT devices that are expected to run consistently for a long period of time without battery replacement. Moreover, in the wake of pervasive IoT, the number of IoT devices has exploded and lead to a tremendous rise in IoT networks carbon footprint. In this regard, Green-IoT and energy management of IoT emerged as challenging and attractive research topics for both academia and industry. In this paper, we conduct a comprehensive and an up-to-date survey on recent energy management techniques in IoT networks. We start by presenting the challenges of energy consumption in IoT networks. Then, we will present novel and well-known energy management approaches for IoT but focus on the most recent solutions proposed in each approach. Next, we will provide a comprehensive survey of the most recent energy management solutions for IoT ecosystem. We will also present recent trends and new research perspectives that can be exploited for energy conservation in IoT networks. Finally, we will give recommendations on how to exploit the techniques presented in our survey to achieve the IoT applications QoS requirements.