The answer to 'why is my cricket trails' is that you likely have a cricket infestation in your home. Crickets leave behind small, dark droppings that can create trails or spotting on surfaces. This is a common sign of a cricket problem, especially if you're also hearing their chirping noises at night.
Crickets are attracted to warm, moist environments and may enter your home through cracks, gaps, or openings around doors and windows. They feed on organic materials like fabrics, paper, and even pet food. Leaving food out or having excess moisture in your home can contribute to a cricket problem.