Insomnia is characterised based on duration:
Acute insomnia (short term) is brief and often happens because of life circumstances (for example, before an exam or after receiving stressful or bad news). Many people experience this type of passing sleep disruption, and it tends to resolve without any treatment.
Chronic insomnia (ongoing) 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…