Recent research on intermittently connected delay-tolerant wireless sensor networks (ICDT-WSNs) focuses on developing robust communication protocols that ensure reliable data delivery despite frequent disconnections and long transmission delays. These networks operate under sparse connectivity and energy constraints, where traditional routing methods fail. Hence, researchers employ delay-tolerant networking principles such as store-carry-forward mechanisms, data mule-assisted transmission, and opportunistic routing to enhance delivery rates. Energy-efficient buffer management, adaptive contact prediction, and context-aware routing are also integrated to optimize data dissemination and reduce latency. Such approaches make ICDT-WSNs highly suitable for remote, mobile, or disaster-prone environments where continuous connectivity cannot be guaranteed.