According to guidelines from a physician group, insomnia is difficulty falling asleep or staying asleep, even when a person has the chance to do so. People with insomnia can feel dissatisfied with their sleep and usually experience one or more of the following symptoms: fatigue, low energy, difficulty concentrating, mood disturbances, and decreased performance in work or at school.

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Insomnia may be characterized based on its duration. Acute insomnia is brief and often happens because of life circumstances (for example, when you can't fall asleep the night before an exam, or after receiving stressful or bad news). Many people may have experienced this type of passing sleep disruption, and it tends to resolve without any intervention.

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Chronic insomnia is disrupted sleep that occurs at least three nights per week and lasts at least three months. Chronic insomnia disorders can have many causes. Changes in the environment, unhealthy sleep habits, shift work, other clinical disorders, and certain medications could lead to a long-term pattern of insufficient sleep. 

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People with insomnia tend to have difficulty falling asleep (onset), staying asleep (maintenance), and/or they wake up too early in the morning.

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Hypnotherapy combined with changes in lifestyle can provide relief.