You can wake a dormant actor by calling AActor::SetNetDormancy(ENetDormancy::DORM_Awake). While the actor is awake, it replicates as normal until it is set back to dormant by calling AActor::SetNetDormancy(ENetDormancy::DORM_DormantAll) from the actor. This is useful in cases where a dormant actor is going to begin changing every frame, such as a stationary object beginning to move.