Quick Answer: Fibromyalgia likely involves central sensitization, genetics, trauma and disrupted sleep. Moldofsky's landmark research described alpha-delta sleep intrusion, and later work in journals like Pain has confirmed that poor sleep amplifies fibromyalgia pain. Talk with your doctor, and focus on sleep support and consistent habits you can control.
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Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Fibromyalgia is a complex medical condition. If you suspect you have fibromyalgia, please consult your physician or a rheumatologist. Mattress Miracle is a mattress retailer, not a healthcare provider.
What Causes Fibromyalgia?
If you have been searching for a simple answer to what causes fibromyalgia, you are not alone. Roughly 2 to 4 percent of Canadians live with fibromyalgia, according to the Canadian Pain Society. Most of them have asked their doctors the same question. And the honest answer is that nobody knows for certain.
What researchers do know is that fibromyalgia is not imagined, not psychological, and not caused by a single broken piece. It is a disorder of central pain processing. Your nervous system becomes more sensitive to pain signals than it should be. And that sensitivity involves several overlapping factors: genetics, trauma, infection, stress, and sleep.
That last one, sleep, is where the research gets genuinely interesting. Because the relationship between fibromyalgia and sleep is not simply that pain keeps people awake. The evidence is now pointing in the other direction as well.
Central Sensitization: When the Volume Gets Stuck on High
The current leading theory behind fibromyalgia causes is called central sensitization. Think of your nervous system as a stereo. Normally, the volume adjusts up and down depending on what is happening. Stub your toe and the volume goes up. The injury heals and the volume goes back down.
In fibromyalgia, the volume knob gets stuck on high. Signals that would normally register as mild pressure or minor discomfort get amplified into genuine pain. Researchers at the National Institutes of Health have confirmed that people with fibromyalgia show measurable differences in how their brains and spinal cords process pain signals (NIAMS, 2024).
What Research Tells Us About Central Sensitization
Studies published in Arthritis & Rheumatology have shown that fibromyalgia patients have elevated levels of substance P (a pain neurotransmitter) in their cerebrospinal fluid and reduced activity in the brain's pain-inhibiting pathways. This is not a psychological phenomenon. It is a measurable change in nervous system function that makes ordinary stimuli feel painful. The technical term is allodynia, and it helps explain why a firm handshake or a seam in clothing can be genuinely uncomfortable for someone with fibromyalgia.
This matters for understanding fibromyalgia causes because central sensitization does not happen overnight. Something has to push the nervous system into that amplified state. And the growing body of evidence suggests that disrupted sleep may be one of those pushes.
Known Fibromyalgia Triggers
While the exact cause remains unclear, researchers have identified several factors that appear to trigger or contribute to fibromyalgia onset. Most people with fibromyalgia can point to at least one of these in their history.
Genetics
Fibromyalgia runs in families. If a first-degree relative has the condition, your risk increases significantly. Research published in the Journal of Pain Research has identified several genetic variations that affect how the body processes pain signals, particularly genes involved in serotonin and dopamine regulation. These same neurotransmitters also play a critical role in sleep.
Physical Trauma
Car accidents, surgeries, repetitive injuries, and significant physical stress are common fibromyalgia triggers. The Canadian Pain Society notes that whiplash injuries and post-surgical recovery are particularly associated with fibromyalgia onset, possibly because they trigger the central sensitization process described above.
Emotional and Psychological Stress
Prolonged stress, post-traumatic stress disorder (PTSD), and major life disruptions are all linked to fibromyalgia triggers. Chronic stress affects the hypothalamic-pituitary-adrenal (HPA) axis, which regulates the body's stress response and is closely tied to sleep architecture.
Infection and Illness
Certain viral and bacterial infections appear to trigger fibromyalgia in some individuals. Epstein-Barr virus, Lyme disease, and hepatitis C have all been associated with fibromyalgia onset in research reviewed by Sleep Medicine Reviews.
Other Conditions
You are more likely to develop fibromyalgia if you already have another chronic pain condition such as rheumatoid arthritis, osteoarthritis, or lupus. The overlap is significant enough that pressure point management becomes a priority for many patients managing multiple conditions.
The Sleep-Pain Cycle: The Connection That Changes Everything
Here is where fibromyalgia and sleep become inseparable.
If you have fibromyalgia, you already know that pain disrupts sleep. That part is obvious. What may surprise you is how strongly the research supports the reverse: that disrupted sleep can actually cause fibromyalgia-like symptoms in otherwise healthy people.
Moldofsky's Landmark Sleep Research
In the 1970s, Dr. Harvey Moldofsky at the University of Toronto conducted a groundbreaking experiment. He took healthy volunteers with no pain conditions and systematically disrupted their deep sleep over several nights. The result was remarkable. These healthy participants developed widespread musculoskeletal pain, tenderness at fibromyalgia tender points, fatigue, and mood disturbances that closely resembled fibromyalgia symptoms. When normal sleep was restored, the symptoms resolved. This research, published in Psychosomatic Medicine, was among the first to suggest that sleep disruption is not just a symptom of fibromyalgia but may be a contributing cause.
The implications of Moldofsky's work are profound. It suggests that fibromyalgia causes may include the very thing that fibromyalgia itself produces: broken sleep. That creates a cycle.
Pain disrupts sleep. Disrupted sleep amplifies pain sensitivity. Amplified pain sensitivity produces more pain. More pain disrupts sleep further. And around it goes.
This is not speculation. A 2019 meta-analysis in Sleep Medicine Reviews confirmed that sleep quality is one of the strongest predictors of next-day pain intensity in fibromyalgia patients. The researchers concluded that improving sleep quality should be considered a primary treatment target, not a secondary one.
Alpha-Delta Sleep Intrusion: The Hidden Sleep Problem
Most people with fibromyalgia are not simply "not sleeping enough." They are sleeping, but their sleep is being invaded.
Moldofsky's research identified a specific sleep abnormality common in fibromyalgia patients called alpha-delta sleep intrusion. During normal deep sleep (delta wave sleep), the brain should be in its slowest, most restorative state. In many fibromyalgia patients, fast alpha waves (the kind associated with waking alertness) intrude into the deep sleep phases.
The result is that you spend time in bed, you may even sleep for seven or eight hours, but your brain never reaches the restorative deep sleep it needs. This is why so many people with fibromyalgia wake up feeling exhausted no matter how long they sleep.
Deep sleep is when the body does its critical repair work. Growth hormone is released primarily during deep sleep. Tissue repair happens during deep sleep. The immune system resets during deep sleep. And the pain-inhibiting pathways that are underactive in fibromyalgia? Those are restored during deep sleep too.
When alpha intrusion steals that deep sleep, the body cannot perform the maintenance it needs. Pain sensitivity increases. Inflammation markers rise. Fatigue compounds. And the cycle tightens another turn.
What We Hear in Brantford
In nearly four decades of helping people find the right mattress here at Mattress Miracle in Brantford, we have heard from many customers living with fibromyalgia. The most common thing they tell us is not "I cannot sleep." It is "I sleep, but I never feel rested." That matches exactly what Moldofsky's research predicts. The sleep is happening, but the quality is compromised. And that distinction matters enormously when it comes to finding solutions.
Breaking the Cycle: What You Can Actually Control
Here is the good news buried inside all this research. The sleep-pain cycle is a cycle. That means it can be interrupted at any point on the loop. And while you cannot control your genetics or undo past trauma, you can directly influence the quality of your sleep environment.
The Canadian Pain Society identifies sleep hygiene as one of the evidence-based interventions for fibromyalgia management. That includes:
Evidence-Based Sleep Improvements for Fibromyalgia
- Consistent schedule: Going to bed and waking at the same time every day helps regulate the circadian rhythm that governs deep sleep stages.
- Temperature control: Most sleep research recommends a bedroom temperature between 16 and 19 degrees Celsius. Fibromyalgia patients often have heightened temperature sensitivity, making this even more important.
- Pressure relief: A sleep surface that distributes body weight evenly can reduce the pressure point pain that triggers nighttime waking. This is one of the most direct interventions available.
- minimise stimulants: Caffeine, alcohol, and screen time close to bed all reduce deep sleep duration, which is precisely the sleep stage that fibromyalgia patients can least afford to lose.
- Movement during the day: Gentle exercise such as walking, swimming, or yoga has been shown to improve deep sleep quality in fibromyalgia patients, according to research in Arthritis & Rheumatology.
Of these, pressure relief and sleep surface quality are the factors that most directly relate to the physical pain component of the cycle. A mattress that creates pressure points at the hips and shoulders triggers pain. Pain triggers alpha intrusion. Alpha intrusion prevents deep sleep. And the cycle starts again.
Choosing the Right Mattress When You Have Fibromyalgia
We are a mattress store, and we want to be straightforward about that. We are not going to pretend a mattress cures fibromyalgia. It does not. Nothing does right now.
But the research is clear that sleep quality directly affects fibromyalgia pain intensity. And your mattress is the single biggest factor in sleep quality that you can change without a prescription.
Based on what the research tells us and what we have learned from fitting customers with fibromyalgia at our Brantford showroom since 1997, here is what tends to matter most:
Pressure Point Distribution
This is the priority. Fibromyalgia tender points often cluster at the shoulders, hips, and knees. A mattress that is too firm creates concentrated pressure at those points. That pressure translates directly into pain, which disrupts sleep, which feeds the cycle.
Support Without Rigidity
The balance matters. You need enough support to maintain spinal alignment but enough give to conform around sensitive areas. For most fibromyalgia patients, this means a medium to medium-soft mattress. Too soft and you lose support. Too firm and you aggravate pressure points. Our fibromyalgia mattress guide for Canada compares specific options.
Motion Isolation
If you sleep with a partner, every movement they make transfers through the mattress and can trigger a pain response or disrupt your fragile deep sleep. This is where mattress choice during fibromyalgia flares becomes especially important.
Temperature Regulation
Many fibromyalgia patients report heightened sensitivity to temperature. A mattress that traps heat can increase discomfort and promote waking. If you notice this pattern, mention it when you visit us. Not every mattress handles heat the same way, and we can help you compare options in person.
Try Before You Decide
Online mattress shopping can be risky for anyone, but it is especially risky when you have a condition that involves heightened sensitivity. What feels fine for five minutes in a showroom might feel very different after twenty. That is why we encourage fibromyalgia patients to spend real time on each mattress. Lie in your actual sleep position. Stay for ten minutes if you need to. Our showroom at 441 1/2 West Street in Brantford is set up for exactly that kind of unhurried testing. Call Brad at (519) 770-0001 to check availability on specific models before you visit.
When to Replace Your Current Mattress
A worn mattress creates new pressure points even if it was ideal when it was new. Sagging, visible impressions, and waking with stiffness that was not there before are signs. For fibromyalgia patients, the replacement timeline can be shorter than average because the threshold for pressure-related pain is lower. Our guide on how often to replace your mattress with fibromyalgia covers the specific signs to watch for.
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441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
Is fibromyalgia caused by poor sleep?
Poor sleep is not the sole cause of fibromyalgia, but research strongly suggests it is a contributing factor. Dr. Harvey Moldofsky's studies demonstrated that disrupting deep sleep in healthy individuals produced fibromyalgia-like symptoms. The current understanding is that fibromyalgia causes include genetics, trauma, and central sensitization, with disrupted sleep acting as both a trigger and an amplifier of the condition.
What is the sleep-pain cycle in fibromyalgia?
The sleep-pain cycle describes a self-reinforcing loop. Fibromyalgia pain disrupts sleep quality, and poor sleep increases pain sensitivity the following day. This creates a cycle where each problem makes the other worse. Research in Sleep Medicine Reviews identifies breaking this cycle through improved sleep quality as a primary treatment target.
What type of mattress is best for fibromyalgia?
Most fibromyalgia patients do best on a medium to medium-soft mattress that provides pressure point relief at the hips and shoulders while maintaining spinal alignment. The ideal firmness varies by body weight and sleep position. At Mattress Miracle in Brantford, we recommend spending at least ten minutes lying on each option in your actual sleep position before deciding.
Can a new mattress reduce fibromyalgia flares?
A mattress alone will not eliminate flares, but reducing pressure point pain during sleep can improve sleep quality, which is one of the strongest predictors of next-day pain intensity in fibromyalgia patients. By interrupting the sleep-pain cycle, the right sleep surface may reduce the frequency or severity of flares over time.
What is alpha-delta sleep intrusion?
Alpha-delta sleep intrusion is a sleep abnormality commonly found in fibromyalgia patients. During deep sleep (delta waves), faster alpha waves (normally associated with waking) intrude and prevent the brain from reaching fully restorative sleep. This was first identified by Dr. Moldofsky at the University of Toronto and helps explain why many fibromyalgia patients sleep for a full night but still wake exhausted.
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Living with fibromyalgia means every pressure point matters. Come test mattresses in person, take as long as you need, and ask us about options specifically suited to fibromyalgia pressure relief. No pressure, no rush. We have been helping Brantford families sleep better since 1997.
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