Chronic insomnia is a sleep disorder characterized by difficulty falling asleep, staying asleep, or experiencing non-restorative sleep for a period of at least three months. It can have a significant impact on a person's daily functioning, including impairing cognitive abilities, mood regulation, and overall quality of life. Chronic insomnia can be caused by a variety of factors, including stress, anxiety, depression, medical conditions, medications, and poor sleep habits. Treatment typically involves a combination of cognitive-behavioral therapy, medications, and lifestyle changes. Research in this area focuses on understanding the underlying causes of chronic insomnia, developing effective treatments, and improving the overall management of the disorder.