Explore the latest research into how Transcranial Magnetic Stimulation (TMS) therapy may influence sleep networks, circadian rhythm and insomnia. Discover how TMS treatment for depression and other mental health conditions may also improve sleep quality.
Human sleep can be split into two main categories: non-rapid eye movement (NREM) and rapid eye movement (REM) sleep.
During NREM sleep, brain activity slows to strengthen memory, repair neural connections and optimise communication between brain cells. During REM sleep, brain activity increases to support emotional processing while temporary muscle paralysis prevents injury during dreaming.
Quality sleep is essential for emotional regulation, memory, concentration, decision-making, problem-solving and overall mental wellbeing. When sleep becomes disrupted, it can significantly affect both physical and mental health.
Neuroimaging studies have identified multiple brain regions involved in regulating sleep. Electrical activity within the brainstem and deeper brain structures helps consolidate memories, restore learning capacity and maintain healthy sleep cycles.
During deep sleep, brain activity naturally reduces, allowing unnecessary neural pathways to be removed while strengthening important connections. Neurotransmitters—the brain's chemical messengers—coordinate these processes by switching off the brain regions responsible for wakefulness.
The body's internal clock, known as the circadian rhythm, helps regulate when we feel awake and when we feel sleepy.
Developing from around four months of age, this biological clock responds primarily to light exposure. As daylight decreases, the brain releases melatonin, reducing alertness and preparing the body for sleep.
Research has shown that individuals living with depression, substance use disorders and eating disorders are more likely to have an evening chronotype, meaning they naturally prefer later sleep and activity patterns.
Even short periods of sleep deprivation can negatively impact physical and mental health. As little as four hours of insufficient sleep has been associated with increased risk of:
Sleep disturbance is also closely linked with depression and suicidal thoughts. Researchers have identified shared biological mechanisms, including increased inflammation and disruption of emotional processing.
Although the relationship remains complex, improving sleep is increasingly recognised as an important part of supporting overall mental health.
Growing research suggests that Transcranial Magnetic Stimulation (TMS) therapy may positively influence the brain networks involved in sleep regulation.
One of the primary effects of TMS treatment is increasing slow-wave brain activity, helping restore cognitive performance and reducing many of the negative effects of sleep deprivation on memory and concentration.
Studies have found that:
Research into TMS for insomnia has also shown widespread changes across brain networks responsible for alertness and sleep regulation. Rather than directly stimulating deep brain structures, TMS appears to influence these areas indirectly through connected neural networks.
In individuals with medication-resistant insomnia, researchers have observed increased sleep cell density following treatment.
High-frequency TMS applied to the right side of the brain has also demonstrated benefits for individuals whose insomnia is closely linked to anxiety.
Brain imaging studies have further shown increases in grey matter volume, while blood tests have identified higher levels of neurotransmitters involved in initiating healthy sleep. These findings resemble those seen in individuals with naturally healthy sleeping patterns.
Interestingly, one study found that combining TMS therapy with transcranial Direct Current Stimulation (tDCS) produced greater clinical improvements than either treatment alone. In this study, tDCS was delivered before TMS to increase the sensitivity of the targeted brain networks, leading to improvements in executive functioning, emotional regulation and sleep quality.
Sleep disturbance is one of the most common symptoms of depression. Even after achieving remission, around 43% of people continue to experience insomnia.
Research investigating TMS for depression has demonstrated improvements in both mood and sleep quality.
One study found improvements after just five sessions of TMS treatment for depression, while a six-week course showed that sleep and mood improved independently of one another.
High-frequency TMS therapy for depression also appears to increase activity within the brain regions responsible for generating restorative slow-wave sleep, resulting in a healthier balance between REM and NREM sleep.
Adolescents with depression and hypersomnia (oversleeping) also experienced substantial improvements following treatment, with melatonin levels returning to those typically seen in healthy individuals.
Sleep disruption is common in neurodegenerative conditions such as Alzheimer's disease and Parkinson's disease.
Research has found that:
Adults with ADHD average around 6.5 hours of sleep each night, well below the recommended 8–9 hours.
Research suggests that adults experiencing reduced attention and slower processing speeds due to poor sleep showed significant improvements in sleep behaviour following TMS therapy.
At Smart TMS, we provide evidence-based, non-invasive TMS therapy for insomnia, depression, anxiety and other mental health conditions. Our personalised TMS treatment programmes are designed to target the underlying brain networks involved in mood, sleep regulation and emotional wellbeing.
Whether you are experiencing chronic insomnia, medication-resistant insomnia, depression-related sleep problems or another condition affecting your sleep, our experienced clinical team will create a tailored treatment plan to meet your individual needs. As a medication-free treatment, TMS therapy offers an alternative option for people looking to improve both their sleep quality and overall mental health.
If you're interested in learning more about TMS for insomnia, TMS for depression or how Transcranial Magnetic Stimulation could support your recovery, contact Smart TMS today to book an assessment with one of our clinicians.
Written by Georgie, Southampton TMS practitioner
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