It is an extreme fear of night or darkness that can cause intense symptoms of anxiety and depression. A fear becomes a phobia when it's excessive, irrational, or impacts your day-to-day life.
<h2><u><em>Nyctophobia is an extreme fear of night or darkness that can cause intense symptoms of anxiety and depression. A fear becomes a phobia when it’s excessive, irrational, or impacts your day-to-day life.</em></u></h2>