Final answer:
If we don't regulate the thoughts in our heads, our minds may wander and become distracted by various internal and external stimuli.
Step-by-step explanation:
When we don't regulate our thoughts, our minds tend to wander and become distracted by various internal and external stimuli. These distractions can range from random thoughts and daydreams to worries and concerns. For example, if you're less busy during the day and not focused on a specific task, your mind may wander to what you're going to have for dinner, what you need to do later, or any other unrelated thoughts. This is known as mind wandering, and it can happen when our minds are not actively engaged in a specific activity.