If you’ve ever been kept awake by scratching in the ceiling or scurrying in the walls, you’re not imagining it. Mice are naturally most active after dark. But why do you hear mice at night while your home seems perfectly quiet during the day?
The answer comes down to survival.
Mice are nocturnal, which means they have evolved to forage, explore and build nests at night. Darkness gives them an advantage. Most of their natural predators, including birds of prey and people, are less active, making it safer to search for food.
Although mice have poor eyesight, they don’t rely on their vision. Instead, they use their keen sense of smell, excellent hearing and sensitive whiskers, called vibrissae, to navigate. Their whiskers detect walls, objects and even changes in air movement, allowing them to move confidently through complete darkness.
So, what are you actually hearing?
The scratching often comes from mice climbing inside wall cavities or roof spaces. Scurrying noises are usually mice following the same established routes every night. Gnawing sounds are another giveaway. Because a mouse’s front teeth never stop growing, it must constantly chew on wood, cardboard and even plastic to keep them at the right length.
Interestingly, mice don’t spend the whole night searching for food. They make several short trips from their nest, returning frequently to feed or check that an area remains safe. This repeated movement is why the noises often seem to come and go throughout the night.
Understanding why you hear mice at night can help you spot an infestation early. Strange noises are often one of the first signs of rodent activity, long before droppings or damage become obvious. Identifying the problem early allows for faster, more targeted control.
At SMARTSENZ®, our Integrated Pest Management approach looks beyond the noise. By understanding mouse behaviour, we identify how rodents entered, why they stayed and how to stop them from returning.
