This quote suggests that during the night, when everything is quiet and still, our minds tend to be more active with thoughts and contemplation. It's a time when we often reflect on our experiences and ponder various aspects of life.
On the other hand, "Day Dreaming" implies that during the day, when we are awake and busy with our daily activities, we often find ourselves daydreaming or letting our imaginations roam freely. It's a contrast between the more practical and logical thinking that occurs during the day and the more imaginative and introspective thinking that happens at night.
In essence, this quote highlights the duality of our thinking processes, with the night representing deeper, introspective thoughts, and the day symbolizing lighter, imaginative daydreams. It reminds us that our minds are constantly active, even when we may not be consciously aware of it, and that both types of thinking have their own value and significance in our lives.