It is commonly known that fear of the dark derives from an innate primal instinct to keep us safe. Since ancient times, darkness has been associated with unknown dangers, and our primitive brain has taught us to avoid unfamiliar environments. Some studies suggest that fear of the dark may be a way to avoid certain nocturnal animals, such as spiders, bats and other insects. This would explain why spiders and bats are some of the most feared animals. In addition, this instinctive reaction may also be due to the fact that darkness limits our vision and our field of detection, which makes us feel more vulnerable. Therefore, fear of the dark is actually a natural instinct that helps us to survive.