Wireless Sensors are one of the cutting edge technologies used for real time applications.In this field, accuracy and response time play significant role.Wireless sensor network is vulnerable to a wide range of attacks due to its deployment in the hostile environment.So need of the day is to use effective mechanism to protect sensor networks against different types of threats. A particularly devastating attack for limited battery sensor nodes is sleep deprivation attack where nodes are forced to wake-up and waste their battery power.Consequently unavoidable circumstances may appear in the application field of sensor network.For this reason, a system model is proposed here to extend the lifetime of wireless sensor network, even in the face of sleep deprivation torture. Hierarchical Lightweight Insomnia Monitoring System Model uses load distribution mechanism to secure sensor network in energy efficient manner.