Wireless systems beyond 5G evolve towards embracing both sensing and communication, resulting in increased convergence of the digital and the physical world. The existence of fused digital-physical realms raises critical questions regarding temporal ordering, causality, and synchronization of events that cannot be addressed solely by imposing ultra-low latency requirements. This talk presented the general concept of timing in wireless communication systems and its relation to effective information generation, processing, transmission, and reconstruction at the senders and receivers. With the increasing importance of sensing and Integrated Sensing and Communications (ISAC), wireless systems evolve towards becoming perceptive wireless networks. Inspired by multisensory perception in humans, the talk will introduce Temporal Windows of Integration (TWI) for wireless systems that combine sensing and communication and show their role in determining causality and simultaneity in perceptive wireless networks. One of the takeaways is that the future Base Stations and Access Points will have a timestamping functionality that determines the chronology of the events, simultaneity, and causality and in that way ensure trustworthiness in the physical-world events that are mapped to the digital infrastructure.