Fear of the dark

Fear of the dark, sometimes referred to clinically as nyctophobia when it becomes severe and persistent, is an apprehension or fear triggered by the absence of light, most commonly observed in young children as a normal part of development but which can persist into or emerge during adulthood in some individuals. In its mild and typical form, wariness of darkness is thought to be an evolutionarily adaptive response, since reduced visibility historically increased vulnerability to predators and other hazards, and this instinct is common across human cultures and even observed in some animal species. The fear becomes clinically significant when it causes excessive anxiety disproportionate to any actual danger, leads to avoidance behaviors such as needing lights on to sleep or refusing to enter dark rooms, and interferes with normal daily functioning or sleep. Contributing factors can include frightening experiences associated with darkness, exposure to scary media, learned behavior from anxious caregivers, or association with other anxiety disorders. Treatment approaches for persistent or severe cases include gradual exposure therapy, cognitive behavioral techniques that address the underlying catastrophic thoughts about darkness, and reassurance-based strategies, particularly effective in children as part of normal developmental support.