When you find yourself zoning out, your brain undergoes a transition characterized by the activation of the default mode network (DMN). During this state, external stimuli processing decreases, leading to reduced awareness of the surrounding environment. Your mind begins to wander spontaneously, engaging in internal mental processes such as daydreaming and self-reflection. Zoning out is not merely a lapse in attention; rather, it involves the redirection of neural resources from external tasks to internal thoughts.