Mental health researchers often use the term “hyperarousal” to describe a state in which the mind and body remain unusually alert, tense, or activated. People experiencing hyperarousal may feel constantly on edge, have trouble relaxing, or find it difficult to sleep.
This condition has long been linked to several mental health disorders, including insomnia, depression, anxiety, post‑traumatic stress disorder (PTSD), and attention deficit hyperactivity disorder (ADHD).
However, scientists have noticed something puzzling. Although many researchers talk about hyperarousal, they do not always mean exactly the same thing when they use the term.
In different studies, hyperarousal can refer to slightly different experiences or symptoms. This lack of clarity makes it harder for scientists and doctors to understand the condition and to design treatments that address it effectively.
To solve this problem, researchers at the Netherlands Institute for Neuroscience decided to take a closer look at what hyperarousal really means. Their goal was to determine whether hyperarousal is a single condition shared across many disorders or whether it actually includes several different forms.
The study was led by researcher Tom Bresser and his colleagues, and the results were published in the medical journal eClinicalMedicine. According to Bresser, scientists already understand quite a lot about how hyperarousal contributes to insomnia.
People with insomnia often experience racing thoughts, heightened alertness, or physical tension that prevents them from falling asleep. But hyperarousal also appears in many other psychological conditions, which raised an important question.
The researchers wanted to know whether all these cases represent the same underlying process or whether different types of hyperarousal might exist.
To explore this question, the research team created a large and detailed questionnaire. Instead of focusing on a single disorder, they combined questions that are normally used to measure symptoms across several mental health conditions.
This approach allowed them to capture many different aspects of how people experience stress, alertness, emotional tension, and mental activation.
Nearly 500 volunteers participated in the study. These participants were recruited through sleepregister.nl, a Dutch research platform where individuals can sign up to take part in sleep‑related studies.
Each participant completed the full set of questions, providing the researchers with a rich dataset about their sleep patterns, emotional state, and mental health experiences.
When the researchers analyzed the responses, they discovered something surprising. Hyperarousal did not appear to be a single uniform condition. Instead, the data revealed seven distinct forms of hyperarousal. These different types appeared across multiple mental health disorders, but their intensity varied depending on the condition.
For example, people with insomnia might experience certain types of hyperarousal more strongly, such as mental alertness or racing thoughts at night. People with anxiety disorders might show other forms of hyperarousal, such as persistent worry or heightened emotional sensitivity.
Meanwhile, individuals with depression, PTSD, panic disorder, or ADHD might display different combinations of these hyperarousal types.
In other words, the study suggests that hyperarousal is not a one‑size‑fits‑all phenomenon. Instead, it may be better understood as a group of related processes that affect the brain and body in different ways.
Based on these findings, the research team developed a new and shorter questionnaire designed specifically to measure these seven types of hyperarousal. This tool makes it easier for researchers to study the condition without having to combine many different questionnaires from separate psychological tests.
According to Bresser, this new tool could help scientists map hyperarousal in a clearer and more comprehensive way. The sleep laboratory at the Netherlands Institute for Neuroscience has already begun using the questionnaire in new studies examining insomnia and anxiety.
The research team is also working to understand how these different forms of hyperarousal are connected to brain activity.
Bresser and his colleagues are investigating which brain regions are involved in each type of hyperarousal. By studying brain mechanisms more closely, scientists hope to better understand how these states develop and why they appear in different mental disorders.
Understanding hyperarousal at a deeper level could also improve psychological treatment. In many cases, patients seek help for one primary problem, such as anxiety or insomnia. But during therapy, clinicians may discover that the person also has symptoms related to other conditions. These overlapping issues can make treatment more complicated.
If doctors can identify the specific types of hyperarousal affecting a patient, they may be able to design more targeted treatment plans. Instead of treating only one disorder, therapists could address the underlying patterns of hyperarousal that contribute to multiple symptoms.
From a scientific perspective, the study highlights an important step toward clarifying a concept that has long been used but not always clearly defined. By identifying multiple types of hyperarousal, the research provides a more detailed framework for understanding how stress, alertness, and emotional activation affect mental health.
At the same time, the findings also show that mental health conditions often share underlying processes. Disorders that appear very different on the surface may actually be linked by similar biological or psychological mechanisms.
Further research will be needed to confirm these findings and explore how the seven forms of hyperarousal interact with brain function and behavior. Still, the study offers a promising new direction for both mental health research and clinical care.
By helping researchers and clinicians understand hyperarousal more precisely, this work may eventually lead to better diagnosis and more personalized treatments for people struggling with insomnia, anxiety, depression, and other mental health challenges.
If you care about mental health, please read studies about 6 foods you can eat to improve mental health, and B vitamins could help prevent depression and anxiety.
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