If you’ve ever struggled to get to sleep at night, you’re not alone.
Insomnia is becoming increasingly common in modern life, quietly affecting millions of people behind closed doors.
Many people experience restless nights, difficulty falling asleep, or waking in the early hours while the mind continues moving long after the day has ended. The body longs for rest, yet the nervous system remains alert. Over time, sleep can begin to feel increasingly distant and unpredictable.
When sleep problems continue for weeks or months, people understandably begin searching for answers.
They adjust their bedtime routine, reduce screen time, explore supplements, meditate, or try techniques designed to quiet the mind. Some of these approaches may help temporarily, yet the cycle of anxiety, hypervigilance and insomnia often continues.
What is frequently overlooked is the role of the nervous system.
Anxiety and insomnia are rarely random disruptions. In many cases they reflect a nervous system that has learned, through stress and experience, to remain on high alert.
The human nervous system is designed above all to ensure survival. When it senses stress, uncertainty or threat, it increases vigilance, sharpens awareness, and prepares the body to respond.
These responses are intelligent and protective.
However, when the stress response remains activated for prolonged periods of time, the nervous system can struggle to fully transition into the deeply restorative states required for sleep.
Understanding this changes the conversation entirely.
Instead of asking:
“Why can’t I sleep?”
A more useful question begins to emerge:
“What is preventing my nervous system from feeling safe enough to rest?”
The Neuroscience of Stress And Sleep
Sleep is not simply the absence of wakefulness.
It is an active neurological process requiring precise coordination between the brain, nervous system and hormones.
Two major systems play an especially important role:
• the autonomic nervous system (ANS)
• the hypothalamic-pituitary-adrenal (HPA) axis
Together, these systems regulate stress physiology, vigilance, emotional arousal, cortisol release, and the body’s ability to transition into rest.
Under healthy conditions, the nervous system gradually shifts toward parasympathetic dominance at night — the “rest and restore” state that supports deep sleep, recovery, immune function and emotional regulation.
However, chronic stress can disrupt this transition.
Research now shows that prolonged stress may create a state of hyperarousal in which the brain remains excessively alert — even during sleep itself.
This helps explain why many people with insomnia feel simultaneously exhausted and unable to switch off.
Why Anxiety Makes Sleep Difficult
If you’ve ever noticed that when you’re feeling anxious, your sleep goes out the window, this is why.
Sleep requires your nervous system to feel safe enough to release vigilance, and ‘let it’s guard down’.
But when anxiety is present, your nervous system remains activated.
Thoughts continue circulating, your body stays prepared for action, and the system continues scanning for potential threat. Even when you feel physically exhausted, your nervous system may struggle to shift into the state required for deep rest.
You may have experienced:
- lying in bed with a racing mind
- waking during the night with a surge of alertness
- feeling tired but wired
- light, fragmented, or unrefreshing sleep
- feeling unable to return to sleep once they wake, as their brain kicks into gear and just won’t switch off.
These experiences are not signs of failure or lack of discipline. They are signals that your brain and nervous system is still operating in a protective mode.
Hyperarousal: When the Brain Stays Alert During Sleep
Modern neuroscience is beginning to reveal more about why this happens.
One of your brain’s key alertness systems is called the locus coeruleus noradrenergic (LC-NE) system.
This system releases noradrenaline — a neurotransmitter involved in vigilance, attention and survival responses.
Under stress, activity within this system increases significantly.
Research now suggests that in people experiencing chronic stress or insomnia, this heightened alertness can persist even during non-REM sleep itself.
Instead of fully disengaging into restorative sleep, the brain continues partially monitoring the environment.
This can lead to:
• increased micro-awakenings
• lighter sleep
• reduced sleep spindles
• impaired REM sleep
• fragmented sleep architecture
In essence, your brain remains partially “on guard.”
At the same time, your HPA axis — the body’s central stress hormone system — also becomes activated.
Stress stimulates corticotropin-releasing hormone (CRH) pathways within the hypothalamus, which in turn activate hypocretin/orexin neurons associated with wakefulness and arousal.
These pathways can generate insomnia-like states even in the absence of immediate external stress.
In other words:
Your body may be tired, but your brain still believes it needs to stay alert.
The Link Between Your Nervous System and Sleep
Your autonomic nervous system (also known as rest and digest system) also plays a major role in sleep quality.
During healthy sleep, your body naturally shifts toward parasympathetic dominance:
• heart rate slows
• muscles soften
• breathing becomes more regulated
• restoration and repair increase
However, chronic stress can keep your sympathetic nervous system activated — the branch associated with your fight-or-flight response
Studies examining heart rate variability (HRV) show that many people with insomnia actually continue showing signs of sympathetic activation even when they are asleep.
This creates a biological state of hypervigilance that interferes with both sleep onset and sleep maintenance.
Poor sleep also increases your sensitivity to stress, as well as your emotional reactivity and nervous system activation — creating a self-perpetuating cycle.
Stress disrupts sleep.
Poor sleep increases stress reactivity.
The nervous system becomes increasingly sensitised.
This is one reason insomnia can become chronic.
Why Some People Are More Sensitive to Stress and Sleep Loss
Researchers now use the term sleep reactivity to describe how strongly a person’s sleep responds to stress.
Some individuals can move through stressful periods with relatively little impact on sleep.
Others experience significant sleep disruption even during moderate stress.
This difference appears to involve the interaction between:
• the autonomic nervous system
• the HPA axis
• emotional regulation circuits
• arousal networks within the brain
In many cases, insomnia vulnerability may relate less to the sleep system itself and more to the brain’s threat-detection and emotional regulation systems.
This understanding can be profoundly validating for people who feel frustrated by persistent sleep difficulties.
The issue is not a lack of discipline.
Often, the nervous system has simply become highly sensitised.
To understand how sleep returns, it helps to look at the conditions that support nervous system regulation.
The Six Foundations of Regulation
Through my work supporting people with anxiety and insomnia, I describe these conditions as The Six Foundations of Regulation.
Nervous system regulation develops within relationships, environments, and daily rhythms. When the foundations below are supported, the nervous system learns flexibility and resilience. When one or more foundations become strained, the system may remain alert for extended periods of time.
Safety
The nervous system constantly evaluates whether the environment feels safe.
This process begins earlier than many people realise. The foundation of safety already starts developing in the womb. During pregnancy, the developing nervous system is influenced by the mother’s physiological state. When a mother experiences ongoing stress or anxiety, stress hormones such as cortisol circulate through the body and can reach the developing baby.
The foetus is not consciously aware of these experiences, yet the developing nervous system is already learning from the surrounding environment. In this way, early patterns of alertness or calm can begin forming even before birth.
After birth, experiences of consistent care, emotional attunement, and predictable responses continue shaping the nervous system. When safety is experienced repeatedly, the body learns that it can settle and restore itself.
When safety has been inconsistent or uncertain, the nervous system may remain more vigilant, continuing to scan the environment even in situations that appear calm on the surface.
Attachment
After birth, the nervous system continues learning about safety through close relationships.
Attachment describes the bond that forms between a child and their caregivers. In the early years of life, the nervous system is still developing and does not yet have the capacity to regulate strong emotions independently. Instead, it relies on the presence and responsiveness of others.
When a baby becomes distressed, a caregiver’s voice, touch, eye contact, and calm presence help the child’s nervous system settle. Through thousands of these small interactions, the developing nervous system learns how to move from activation back into calm. This process is often referred to as co-regulation.
Over time, these repeated experiences form internal patterns within the nervous system. The child gradually develops the capacity to regulate emotions, manage stress, and return to balance.
When attachment relationships are secure and responsive, the nervous system develops a stable foundation for emotional and physiological regulation. When those experiences are inconsistent, unpredictable, or absent, the nervous system may remain more vigilant, carrying forward patterns of alertness that can later appear as anxiety or sleep difficulties.
Authenticity
A regulated nervous system requires space for authentic emotional expression.
When emotions can be expressed openly and received with understanding, the body learns that feelings can move through safely. Emotional experiences become part of the natural flow of life rather than something that must be suppressed or hidden.
When emotions are repeatedly held back, the nervous system may carry ongoing tension and vigilance.
Connection
Human beings are deeply social, and our nervous systems expect connection with others.
Connection includes relationships, friendships, and a sense of belonging within community. These experiences provide reassurance and shared safety that support long-term nervous system regulation.
Periods of isolation or disconnection can increase stress responses within the nervous system.
Agency
Agency refers to the experience of having influence over one’s life and the ability to respond to the world from an authentic internal position rather than purely through adaptation or survival.
A healthy sense of agency allows a person to make decisions, express boundaries, take action, and shape their environment in ways that align with their needs and values.
The foundation of agency begins with interoception — the ability to sense and interpret the internal signals of the body. This includes awareness of bodily sensations, emotions, tension, discomfort, instinct, and internal cues.
When interoception is strong, individuals become more able to recognise what feels safe, overwhelming, aligned, or necessary. From this awareness, agency can begin to emerge.
Over time, the nervous system learns that it is possible not only to sense internal experience, but also to respond to it. This supports emotional wellbeing, self-trust, and nervous system regulation.
Rhythm
The nervous system is deeply influenced by biological rhythm.
Daily cycles of light and darkness, breathing patterns, movement, and regular routines all shape how the nervous system functions. Rhythm anchors the body within predictable patterns that support recovery and balance.
Consistent sleep timing, exposure to natural light, and regular movement all support the restoration of healthy sleep and nervous system regulation.
Modern life often disrupts these natural rhythms, contributing to stress and sleep disturbance.
Restoring Sleep Through Nervous System Regulation
When the foundations of regulation begin strengthening, the nervous system gradually learns that constant vigilance is no longer necessary.
Sleep becomes more accessible.
The body regains its capacity for restoration.
This process rarely happens overnight though.
Nervous system healing occurs gradually through repeated experiences of safety, rhythm, connection, emotional expression and regulation.
Simple Ways to Begin Supporting Your Nervous System Today
When people experience chronic stress or insomnia, there is often a strong urge to “fix” sleep as quickly as possible.
However, nervous system regulation usually begins with small, consistent experiences of safety and restoration rather than force or perfection.
The goal is not to control the body, but to help the nervous system gradually recognise that it no longer needs to remain in a constant state of alertness.
Below are some gentle starting points that can help support this process.
1. Reduce Stimulation Before Bed
Many modern environments keep the brain in a state of ongoing activation.
Bright lights, constant notifications, work, emotionally charged content, and excessive screen exposure can all increase nervous system arousal and delay the transition into sleep.
Creating a slower, quieter transition into the evening can help signal safety to the brain.
This may include:
• dimming lights after sunset
• reducing phone use before bed
• listening to calming audio or music
• avoiding emotionally activating conversations late at night
• creating predictable evening rituals
The nervous system responds strongly to rhythm and repetition.
2. Support Circadian Rhythm Through Morning Light
One of the most powerful ways to regulate sleep-wake cycles is exposure to natural light early in the day.
Morning sunlight helps regulate circadian rhythms, cortisol timing and melatonin production later that evening.
Even 10–20 minutes of outdoor morning light can help anchor the nervous system within a healthier biological rhythm.
3. Focus on Regulation Rather Than Forcing Sleep
Many people with insomnia become highly focused on “trying” to sleep.
Unfortunately, effort and pressure often increase hypervigilance and sympathetic activation.
Instead of asking:
“How do I make myself sleep?”
it can help to ask:
“How can I help my body feel safer and more settled right now?”
Rest often begins returning when the nervous system no longer feels under threat.
4. Slow the Body Before Trying to Slow the Mind
For many people, anxiety is experienced not only mentally but physiologically.
The body may remain tense, activated or braced without conscious awareness.
Gentle body-based practices can help shift the nervous system toward parasympathetic regulation.
Examples include:
• slow breathing
• yoga nidra
• meditation
• gentle stretching
• progressive muscle relaxation
• grounding practices
• slower nasal breathing
Sometimes calming the body first allows the mind to follow.
5. Reduce Internal Pressure Around Sleep
One difficult aspect of insomnia is the fear that develops around not sleeping.
Over time, the brain can begin associating bedtime itself with stress, frustration or vigilance.
Practicing self-compassion and reducing catastrophic thinking around sleep can help interrupt this cycle.
A difficult night does not mean the body is broken.
The nervous system is adaptive and capable of change.
6. Rebuild Rhythm and Predictability
The nervous system responds well to consistency.
Regular sleep-wake times, meals, movement, light exposure and moments of rest all help reinforce biological stability.
This does not require perfection.
Even small daily rhythms can help communicate safety and predictability to the brain and body over time.
7. Seek Support When Needed
Persistent insomnia and chronic nervous system activation can feel incredibly isolating.
Supportive therapeutic work can help people understand the deeper patterns contributing to hyperarousal, emotional overwhelm and sleep disruption.
For many individuals, healing begins not simply through “better sleep habits,” but through learning how to feel safe enough to rest again.
Restoring Sleep Through Nervous System Regulation
When the foundations of regulation begin strengthening, the nervous system gradually learns that constant vigilance is no longer necessary.
Sleep becomes more accessible, and the body regains its capacity for restoration.
But this process rarely happens overnight.
Nervous system healing occurs gradually through repeated experiences of safety, rhythm, connection, emotional expression and regulation.
In my work through Project Pure, I support people experiencing anxiety and insomnia through a therapeutic approach called Deep Release Therapy (DRT).
Rather than focusing solely on sleep hygiene or symptom management, this work explores the deeper nervous system patterns that may be maintaining states of chronic alertness and hyperarousal.
As these patterns begin to shift, many people notice changes not only in sleep, but also in:
• emotional balance
• energy levels
• resilience
• nervous system flexibility
• overall wellbeing
A Different Way to Understand Insomnia
Insomnia is not always simply a problem of sleep.
Often it reflects a nervous system that no longer feels fully safe enough to let go.
Modern neuroscience increasingly supports what many people intuitively feel:
The brain and body cannot fully rest while they remain in survival mode.
Understanding the relationship between stress physiology, hyperarousal and nervous system regulation offers a more compassionate and biologically informed way of understanding insomnia.
When the foundations of regulation are restored, the nervous system gradually rediscovers its capacity for calm.
And from that place, sleep often begins to return naturally
About the Author
Annelies Basten, MPsych, is a psycho-somatic therapist and founder of Project Pure. Her work focuses on nervous system regulation and the restoration of healthy sleep and calm, grounded living.
Drawing from psychology, trauma-informed therapy, meditation, and her own lived experience of recovering from chronic insomnia, she supports people experiencing anxiety and sleep difficulties through a therapeutic approach called Deep Release Therapy (DRT).
Annelies works with clients from Sumner, Christchurch (in-person or online), helping them restore the foundations of regulation so the nervous system can settle and natural sleep can return.
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