Insomnia is a sleep disorder characterized by difficulty falling asleep, staying asleep, or waking up too early and not being able to return to sleep. This condition can lead to daytime fatigue, irritability, and difficulty concentrating. Insomnia can be short-term, lasting a few days or weeks, or chronic, persisting for months or even years. Various factors can contribute to insomnia, including stress, anxiety, medical conditions, and certain medications. Lifestyle choices, such as excessive caffeine or irregular sleep schedules, can also play a role. Treatment options may include lifestyle changes, therapy, or medication, depending on the underlying causes.