Is this insomnia, or just a bad patch?

"Insomnia" is loosely used in everyday language to describe any stretch of poor sleep, but the clinical definition is more specific, and the distinction matters because it changes what works. Chronic insomnia disorder requires difficulty initiating or maintaining sleep on at least three nights a week, persisting for at least three months, and causing measurable daytime impairment. A difficult fortnight is not insomnia disorder. Months of pattern, with predictable daytime cost, often is. Knowing which category your difficulty falls into is the first useful piece of information.

Written and reviewed by Matthew Hallam, Registered Psychologist (AHPRA PSY0002471369). 4 min read. Published 7 June 2026. Last reviewed 7 June 2026. Next review 7 June 2027.

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When sleep difficulty is short-term

Short-term insomnia is sleep difficulty that has lasted less than three months. It often arrives in response to a specific trigger. An illness. A stressful period. A new baby. A grief. A change in shift or schedule. A relationship rupture. The body's sleep system is sensitive to disturbance, and when life puts pressure on it, sleep responds.

What distinguishes short-term insomnia is that it tends to settle as the trigger settles. The body is doing what it is built to do. Sleep is disrupted while the disruption is happening, and it returns when the disruption passes. This is not failure. It is the system responding to its inputs. Support, in this category, is usually a matter of protecting the wake time, avoiding the impulse to compensate by spending more time in bed, and waiting for the trigger to pass without amplifying the difficulty.

When sleep difficulty becomes chronic

Chronic insomnia disorder, as defined in the International Classification of Sleep Disorders (American Academy of Sleep Medicine, 2023), requires three things. Difficulty initiating or maintaining sleep on at least three nights a week. This pattern persisting for at least three months. And measurable daytime impairment such as fatigue, low mood, irritability, reduced concentration, or difficulty functioning.

The defining feature of chronic insomnia is that the pattern has typically acquired its own perpetuating factors. The bed has become associated with cognitive arousal. Beliefs about sleep have hardened. The night has become a place of monitoring and effort. These factors keep the insomnia going even after the original trigger has passed. This is why a person whose stressful period ended six months ago can still be sleeping badly. The trigger is gone. The pattern it set up has become self-sustaining.

Why the distinction matters

The two categories ask for different responses. Short-term insomnia usually does not need treatment beyond protecting the wake time, avoiding excessive napping, and waiting for the trigger to settle. Trying to treat short-term insomnia aggressively can sometimes turn it into the chronic kind by introducing the monitoring and effort patterns that perpetuate it.

Chronic insomnia disorder, by contrast, has a first-line treatment with strong evidence behind it: cognitive behavioural therapy for insomnia, or CBT-I. Sleep hygiene alone is not the treatment for chronic insomnia. The clinical guidance on this is clear and consistent. Treating chronic insomnia as if it were a short-term problem, by adjusting sleep hygiene and waiting, usually does not work, because the perpetuating factors are not addressed by hygiene alone.

In Australia, chronic insomnia disorder affects roughly 1 in 7 adults (Reynolds et al., 2019). It is common. It is also treatable, but the treatment depends on which category the difficulty actually falls into. A difficult fortnight is not insomnia disorder. Months of pattern, with predictable daytime cost, often is. Naming the category accurately is not about handing yourself a diagnosis. It is about choosing the right response. If the difficulty has been brief and is tied to a clear trigger, the most useful work is often supporting the body through the disruption without amplifying it. If the difficulty has been long and is no longer obviously tied to its original cause, the most useful work is recognising that perpetuating factors are now in play, and that these have specific, evidence-based treatments that target them directly. Knowing which kind of work is the right one is the first piece of information that makes everything else easier.

This content is general information only. It is not a substitute for individual psychological or medical advice. Reading this does not establish a therapeutic relationship with Equal Psychology or any of their clinicians.