An INSOMNIAC is someone who suffers from insomnia, which is a sleep disorder characterized by difficulty falling asleep or staying asleep. Insomnia can be caused by a variety of factors, including stress, anxiety, depression, and certain medications. People with insomnia often experience fatigue, irritability, and difficulty concentrating during the day. Treatment for insomnia typically includes lifestyle changes, such as avoiding caffeine and alcohol before bed, and cognitive behavioral therapy. In some cases, medication may also be prescribed.