Acute and chronic insomnia
Acute insomnia is short-term, usually attached to an identifiable stressor such as worry, illness, grief or a change in circumstances. It commonly resolves when the situation does.
Chronic insomnia disorder is trouble falling asleep or staying asleep at least 3 nights per week, for at least 3 months, that affects how you function during the day. This is the threshold that separates a run of bad nights from a condition warranting assessment.
What causes insomnia
- Medical conditions, particularly those causing chronic pain, and hormonal changes
- Other sleep disorders, especially obstructive sleep apnoea
- Caffeine, nicotine and alcohol
- Mental health conditions and stress
- Some medicines
- Irregular sleep timing, shift work, and screen use before bed
Insomnia and obstructive sleep apnoea often occur together, and the combination is assessed differently from insomnia alone.
How insomnia is assessed
There is no specific test to diagnose insomnia. A doctor will usually ask you to keep a sleep diary for a couple of weeks and will ask about your sleep habits, your medicines, and your caffeine and alcohol intake. Questionnaires are commonly used.
Where the history suggests sleep apnoea, restless legs or another sleep disorder, a sleep study may be arranged. Screening for depression, anxiety and pain is standard, since these frequently sit underneath a sleep complaint.
How insomnia is usually managed in Australia
Cognitive behavioural therapy for insomnia, known as CBT-i, is recommended as first-line treatment in Australian general practice guidelines. It works on the behaviours and thought patterns that keep insomnia going, and it outperforms sleep medicines over the longer term. It is available face to face, through digital programmes, and by telehealth.
Sleep hygiene and relaxation techniques support that work: consistent timing, a wind-down routine, limiting caffeine and alcohol, and getting out of bed when sleep is not coming.
Medicines are considered where other approaches have not been effective, and are generally intended for short-term use.