Insomnia is a sleep disorder characterized by persistent difficulties in falling asleep, staying asleep, or experiencing non-restorative sleep, despite having adequate opportunities for sleep. It is a common condition that affects a significant portion of the population at some point in their lives.

Individuals with insomnia often experience a range of symptoms that can significantly impact their daily functioning and overall well-being. These symptoms include difficulty initiating sleep, frequent awakenings during the night, early morning awakenings, and a feeling of non-refreshing sleep. As a result, they may suffer from excessive daytime sleepiness, fatigue, irritability, difficulty concentrating, and impaired cognitive function.

Insomnia can be classified into two main types: acute insomnia and chronic insomnia. Acute insomnia is typically brief and often occurs in response to a specific event or stressful situation, such as a traumatic experience, jet lag, or temporary lifestyle changes. It usually resolves without treatment once the underlying cause is addressed.