What is insomnia classified as?

Insomnia is classified as a sleep disorder because it specifically pertains to an individual's inability to fall asleep, stay asleep, or experience restorative sleep. This condition can lead to various negative outcomes, including fatigue, difficulty concentrating, and impaired functioning during daily activities. The category of sleep disorders encompasses a range of conditions that affect sleep quality, timing, and duration, highlighting insomnia's role in disrupting the normal sleep cycle and overall health.

In contrast, the other classifications provided do not accurately reflect the nature of insomnia. For example, it does not relate to mental health issues categorized as depression, nor does it pertain to digestive functions or cardiac health. Each of those areas has distinct characteristics that do not align with the primary symptoms and impacts associated with insomnia. Thus, identifying insomnia as a sleep disorder is essential for understanding its origins and potential treatments.