This quote suggests that there's no need for sadness or tears when it comes to the creatures of the night. It alludes to the idea that these nocturnal beings, which include animals and perhaps metaphorically, people who are active during the night, have their own unique way of life and existence.
In the natural world, many animals are adapted to thrive during the nighttime hours. They have special senses and behaviors that help them navigate in darkness. Rather than feeling sorrow for them, we can appreciate the beauty and complexity of their adaptations.
On a metaphorical level, this quote might also imply that individuals who prefer or are more active at night shouldn't be pitied or judged. People have different lifestyles and schedules, and what might seem unusual to one person is entirely normal for another. So, it encourages an understanding and acceptance of diversity in how people choose to live their lives.