Most people think of sleep problems as simply not sleeping enough. However, sleep disorders are a much broader category than most patients realize. Some affect breathing. Others affect movement, brain chemistry, or the body’s internal clock. Many go undiagnosed for years because the symptoms appear during sleep and are invisible to the person experiencing them.
This guide explains the most common sleep disorders, what symptoms they cause, and when it makes sense to get a formal assessment from a sleep medicine physician.
What Counts as a Sleep Disorder?
A sleep disorder is any condition that consistently disrupts the quality, timing, or duration of sleep in a way that affects daytime functioning. The key word is consistently. A few rough nights after a stressful week do not constitute a disorder. However, ongoing symptoms that affect your ability to function, concentrate, or feel rested are worth investigating.
Sleep disorders affect millions of Canadians. Most are highly treatable once correctly identified. The challenge is that many patients live with symptoms for years without connecting them to a medical condition, because the symptoms during sleep are invisible and the daytime effects, fatigue, poor concentration, mood changes, are easy to attribute to other causes.
Sleep disorders are diagnosed by a sleep medicine physician based on clinical history, validated questionnaires, and in many cases a diagnostic sleep test.
The Most Common Sleep Disorders
Obstructive Sleep Apnea (OSA)
Obstructive sleep apnea is the most frequently diagnosed sleep disorder in Canada. It occurs when the upper airway collapses repeatedly during sleep, causing breathing to stop briefly and repeatedly throughout the night. Most people with OSA are unaware of these events. Partners, however, often notice loud snoring, gasping, or witnessed pauses in breathing.
Common daytime symptoms include persistent fatigue, morning headaches, difficulty concentrating, and irritability. Left untreated, OSA is associated with increased risk of cardiovascular disease, hypertension, and metabolic conditions. This is why early diagnostic sleep testing matters, the sooner an accurate diagnosis is made, the sooner treatment can begin.
Insomnia
Insomnia is defined as difficulty falling asleep, staying asleep, or waking too early on a regular basis, despite having adequate opportunity to sleep. It is one of the most common sleep complaints in primary care. Chronic insomnia persists for three months or more and significantly affects daytime function, including work performance, mood, and physical health.
Insomnia is often treated with cognitive behavioural therapy for insomnia (CBT-I), which has strong evidence supporting its effectiveness. Medication may play a role in some cases, but it is typically not the first-line approach. A clinical consultation with a sleep medicine physician is the appropriate starting point to determine the right treatment for your situation.
Restless Leg Syndrome (RLS)
Restless leg syndrome causes uncomfortable sensations in the legs, often described as crawling, tingling, or an irresistible urge to move, that worsen at rest and particularly in the evening. Moving the legs temporarily relieves the sensation. As a result, falling asleep becomes difficult and staying asleep is a consistent challenge.
RLS can occur on its own or alongside other conditions, including iron deficiency, kidney disease, or pregnancy. A sleep medicine physician can assess contributing factors and recommend appropriate treatment. Because RLS worsens in the evening, it is frequently dismissed as general restlessness or anxiety before the correct diagnosis is made.
Periodic Limb Movement Disorder (PLMD)
Periodic limb movement disorder involves repetitive leg movements during sleep that the person is usually unaware of. Unlike RLS, PLMD occurs during sleep rather than at rest before sleep. A bed partner may notice the movements. The person experiencing them typically presents with unexplained daytime fatigue and unrefreshing sleep.
PLMD is diagnosed through an in-lab sleep study, which captures limb movement data alongside other physiological signals. It frequently coexists with RLS and other sleep disorders, which is why a thorough assessment matters before starting any treatment.
Narcolepsy
Narcolepsy is a neurological sleep disorder characterized by excessive daytime sleepiness, sudden muscle weakness triggered by emotion (cataplexy), and in some cases sleep paralysis or vivid hallucinations at sleep onset. It results from a deficiency of a brain chemical called orexin, also known as hypocretin.
Narcolepsy is frequently misdiagnosed or delayed in diagnosis because the symptoms overlap with many other conditions, including depression, medication side effects, and other sleep disorders. If excessive sleepiness is a primary complaint and standard explanations have been ruled out, assessment by a sleep medicine physician with experience in narcolepsy is appropriate.
Parasomnias
Parasomnias are a group of disorders involving abnormal behaviours, movements, or experiences during sleep. They include sleepwalking, sleep talking, REM sleep behaviour disorder, where people physically act out dreams, and night terrors. Many parasomnias are benign. However, some, particularly REM sleep behaviour disorder, may be associated with neurological conditions and warrant formal evaluation by a specialist.
If you or a family member experiences behaviours during sleep that are unusual, disruptive, or potentially dangerous, a sleep consultation is the appropriate next step.
Circadian Rhythm Sleep-Wake Disorders
The body’s internal clock regulates the timing of sleep and wakefulness. When that clock is misaligned with a person’s daily schedule, a circadian rhythm disorder results. Common examples include delayed sleep phase disorder, difficulty falling asleep until very late and waking late, and shift work disorder, which affects people whose work schedules conflict with their natural sleep-wake cycle.
Circadian rhythm disorders are more than inconvenient. Over time, chronic misalignment is associated with metabolic, cardiovascular, and mental health consequences. Treatment typically involves light therapy, behavioural strategies, and in some cases melatonin under physician guidance.
When Should You Get Assessed?
A sleep assessment is appropriate when sleep problems are consistent, not occasional. Consider booking a consultation if any of the following apply:
- You regularly wake unrefreshed despite getting enough hours of sleep
- A partner has observed snoring, gasping, or pauses in breathing
- You struggle with excessive daytime sleepiness that affects your work or safety
- You experience uncomfortable sensations in your legs that disrupt sleep
- You have unusual behaviours during sleep, such as acting out dreams or sleepwalking
- You have been told your sleep seems abnormal and you are not sure why
- You have a cardiovascular condition, diabetes, or obesity and have never been assessed for a sleep disorder
Many of these conditions are highly treatable. However, treatment requires an accurate diagnosis first. Living with undiagnosed symptoms for months or years is common, but it is not necessary.
How Sleep Disorders Are Diagnosed
A sleep medicine physician begins with a detailed clinical history, your symptoms, your schedule, your medical background, and any relevant observations from a partner or family member. Depending on the clinical picture, they may recommend a home sleep test or an in-lab polysomnography.
In-lab diagnostic sleep testing captures brain activity, breathing, oxygen levels, movement, and eye activity simultaneously. This makes it the appropriate tool for diagnosing complex or overlapping sleep disorders. Home sleep tests capture a more focused set of breathing and oxygen signals and are most appropriate for straightforward OSA assessment.
A trained sleep technologist conducts in-lab studies and ensures signal quality throughout the night. The data is then scored and interpreted by a sleep medicine physician, who produces a report with a clear diagnosis and treatment recommendation.
MedSleep has locations across Canada in Alberta, British Columbia, New Brunswick, Nova Scotia, and Ontario, offering both home and in-lab testing options.
What Happens After a Diagnosis?
A diagnosis is the beginning of a clear treatment pathway, not an endpoint. Depending on what the assessment finds, your sleep medicine physician will outline options appropriate for your specific condition. For OSA, this typically means CPAP therapy or an oral appliance. For insomnia, CBT-I is the first-line treatment. For RLS and PLMD, treatment may involve lifestyle changes, supplementation, or medication.
Follow-up is an important part of the process. A good community sleep clinic will ensure you understand your results, your treatment options, and what ongoing monitoring looks like. If you have been diagnosed and feel your follow-up care has been insufficient, that is worth addressing directly with your clinic.
Frequently Asked Questions
Can I have more than one sleep disorder at once?
Yes. It is not uncommon for sleep apnea to coexist with insomnia, or for RLS to occur alongside PLMD. Overlapping conditions are one reason a thorough clinical assessment is important before starting treatment. Treating one condition without identifying others can leave significant symptoms unresolved.
Is poor sleep just part of getting older?
Disturbed sleep becomes more common with age, but it is not inevitable or untreatable. Many older adults have undiagnosed sleep disorders contributing to their sleep quality. Age alone is not a reason to accept poor sleep without investigation.
Do I need a referral to see a sleep medicine physician?
In most provinces, a referral from your family doctor, nurse practitioner, or another specialist is required. In Ontario and British Columbia, the referral must come from a physician or nurse practitioner. Contact your nearest MedSleep community sleep clinic for guidance on the referral process in your province.
How long does it take to get a diagnosis?
This varies by clinic and by the type of test recommended. At a community sleep clinic like MedSleep, wait times for an initial consultation and diagnostic testing are typically shorter than at hospital-based programs. After your test is completed, results are usually reviewed with you within two to three weeks.
What if my test results come back normal but I still feel terrible?
A normal result on one type of test does not rule out all sleep disorders. For example, a home sleep test may miss conditions that require in-lab monitoring, such as PLMD, narcolepsy, or parasomnias. If your symptoms persist after a negative result, discuss this directly with your sleep medicine physician, a different test or a broader assessment may be appropriate.
Ready to get assessed? Book a sleep consultation at MedSleep.
