Insomnia disorder is a condition that affects many people across the world. It is characterized by difficulty in falling asleep or staying asleep, leading to a range of health problems. There are several synonyms for insomnia disorder, which include sleeplessness, wakefulness, restlessness, and sleep deprivation. Other terms that can be used to describe this condition include nocturnal wakefulness, sleep disturbance, and chronic insomnia. People who suffer from insomnia may experience fatigue, irritability, anxiety, and impaired cognitive function. Identifying and treating insomnia disorder early can help alleviate symptoms and improve overall sleep quality and wellbeing. Therefore, it's essential to seek medical advice when experiencing persistent insomnia.