Which of the following statements is true regarding insomnia?

The statement that insomnia can lead to emotional distress and daytime fatigue is accurate and highlights the common impacts of this sleep disorder. Insomnia is characterized by difficulty in falling asleep or staying asleep, which can significantly disrupt a person's ability to function during the day. When individuals experience inadequate sleep, it can result in fatigue, decreased concentration, irritability, and emotional instability. These effects can exacerbate existing issues or create new challenges in personal and professional settings.

Insomnia is a multifaceted condition that may be influenced by various factors including stress, lifestyle habits, medical conditions, and environmental factors, rather than being solely caused by one specific source. Understanding this can help in developing a holistic approach to managing and treating insomnia, considering both the psychological and physiological aspects involved.