Sleep Study or Insomnia Treatment? How to Tell Which You Need

Most people whose main problem is insomnia do not need a sleep study. Chronic insomnia is diagnosed from your history, a sleep diary and a clinical interview, and the American Academy of Sleep Medicine (AASM) says overnight polysomnography is not indicated in the routine evaluation of chronic insomnia, including insomnia linked to depression or anxiety. The treatment the AASM strongly recommends is cognitive behavioral therapy for insomnia (CBT-I), not a test.

A sleep study becomes the right next step when something else may be going on: loud snoring with pauses in breathing, gasping, heavy daytime sleepiness, kicking or jerking legs, violent movements in sleep, or insomnia that has not improved with proper treatment. This guide explains how to tell those situations apart, which kind of study fits which question, and who orders it.

The short answer: which path fits your symptoms

Start with the pattern of your nights and days rather than with a test. The table below is a sorting aid, not a diagnosis; a clinician still has to put the pieces together.

Insomnia is diagnosed by history, not by a lab

Insomnia means difficulty starting sleep, staying asleep, or getting sleep of good quality despite adequate opportunity to sleep, with some kind of daytime impairment. Under the International Classification of Sleep Disorders (ICSD-3) criteria, chronic insomnia disorder requires the sleep problem and its daytime effects to occur at least three times per week and to have been present for at least three months.

A polysomnogram measures brain waves, breathing, oxygen and leg movements for one night in a lab. That is useful for finding apnea or abnormal movements, but it does not show whether you have insomnia, because insomnia is defined by your experience of sleep over weeks. This is why the AASM's insomnia guideline lists polysomnography and daytime multiple sleep latency testing as not indicated for routine insomnia evaluation.

What your clinician will actually use

• A sleep diary kept for about two weeks: bedtime, time to fall asleep, awakenings, final wake time, naps, caffeine and alcohol.
• A history of when the problem started, what was happening in your life, and what you have already tried.
• A review of mood, anxiety, pain, breathing at night and other medical conditions, since insomnia often occurs alongside them. The sibling guide on medical conditions to rule out before a psychiatric diagnosis covers this overlap in more detail.
• A full medication and supplement list, including over-the-counter sleep aids.

For treatment of chronic insomnia, the AASM gives a strong recommendation for multicomponent CBT-I, and it suggests not using sleep hygiene advice alone as a single treatment. The guide to insomnia treatment options compared walks through CBT-I, brief behavioral therapy and medication in depth.

Signs that point to sleep apnea instead

Obstructive sleep apnea is a breathing disorder in which the upper airway narrows during sleep and impairs normal breathing. Because it disrupts sleep, it can be mistaken for insomnia. The clues are different, though: the AASM's risk signs for apnea are daytime sleepiness with loud habitual snoring, witnessed pauses or gasping, and high blood pressure.

The STOP-Bang screening questions

STOP-Bang is a screening questionnaire with eight yes-or-no items: snoring, tiredness, observed apnea, high blood pressure, body mass index, age, neck circumference and male sex. Scores run from 0 to 8; a score of 0 to 2 is classed as low risk for moderate to severe sleep apnea and 5 to 8 as high risk, with the middle range needing other information to sort out.

Screening tools are good at flagging people who need testing, but they are not a diagnosis. The AASM's diagnostic guideline makes a strong recommendation that questionnaires, clinical tools and prediction algorithms not be used to diagnose sleep apnea in adults without an actual sleep test. Its review found that STOP-Bang had high sensitivity but low specificity, meaning it catches many people who have apnea and also flags many who do not.

When the AASM considers risk high

The AASM describes increased risk of moderate to severe sleep apnea as excessive daytime sleepiness plus at least two of three features: habitual loud snoring, witnessed apnea or gasping or choking, or diagnosed high blood pressure. If that describes you, raise it directly.

Home sleep apnea test or in-lab polysomnography

There are two main ways to test for sleep apnea, and the choice depends on your health, not only on convenience. The AASM recommends either in-lab polysomnography or a home sleep apnea test with a technically adequate device for uncomplicated adults whose signs and symptoms indicate increased risk of moderate to severe sleep apnea.

Who should go straight to the lab

The AASM makes a strong recommendation for in-lab polysomnography rather than home testing in people with significant heart or lung disease, possible respiratory muscle weakness from a neuromuscular condition, awake hypoventilation or suspected sleep-related hypoventilation, chronic opioid medication use, a history of stroke, or severe insomnia. The last item matters for psychiatric patients: if your insomnia is severe and apnea is also suspected, a home test may not be the right tool.

The guideline also says home testing should be run by an accredited sleep center under the supervision of a board-certified or board-eligible sleep medicine provider. A home test is a medical test with interpretation and follow-up, not a consumer gadget. Wearables and phone apps are not diagnostic sleep studies; even a smartwatch feature with FDA 510(k) clearance is described as identifying signs of moderate to severe sleep apnea for you to discuss with a health care professional.

Restless legs and limb movements

Restless legs syndrome is an urge to move the legs with uncomfortable sensations, usually in the late afternoon or evening or at rest, that eases with movement. There is no specific diagnostic test for it; a clinician reviews your symptoms, history and medications, and blood tests can help rule out other causes such as low iron. Periodic limb movement disorder is different: repetitive leg jerks during sleep that you may not notice, which are recorded on in-lab polysomnography.

The AASM's 2025 restless legs guideline says clinicians should check iron studies, including ferritin and transferrin saturation, in all patients with clinically significant restless legs, ideally in the morning and after avoiding iron-containing supplements and foods for at least 24 hours. It also names exacerbating factors to address first, including alcohol, caffeine, and antihistamine, serotonergic and antidopaminergic medications, as well as untreated sleep apnea.

That list overlaps with common psychiatric medications. If your legs became restless after starting or changing a medication, tell the prescriber rather than stopping it on your own. There are often ways to adjust timing, dose or choice of medication under supervision.

When insomnia and apnea overlap

Insomnia and sleep apnea can occur together, and the presence of one sleep disorder does not exclude another. The AASM also notes that severe insomnia can interfere with the accuracy of a home sleep apnea test.

Three practical points follow from the guidelines:

1. If insomnia is severe and apnea is suspected, in-lab polysomnography is preferred over home testing.
2. If insomnia treatment fails, behavioral or medication-based, that is itself a reason to consider polysomnography.
3. Treating one disorder does not rule out the other. If snoring improves but sleep does not, or sleep improves but sleepiness does not, go back to your clinician.

Who orders a sleep study, and what happens next

Sleep studies are usually ordered by a primary care clinician, a sleep medicine specialist, or another treating physician after an evaluation. Many people start with their primary care doctor, who can screen for apnea, order the test or refer to a sleep center. Psychiatric clinicians may also notice the warning signs, since sleep is part of most mental health conversations. The guide on how your psychiatrist and primary care doctor should work together explains how to keep both informed.

A typical sequence

1. A clinician takes a sleep history and asks about snoring, breathing pauses, sleepiness, leg symptoms and unusual behaviors in sleep.
2. If apnea is suspected, the AASM's good practice statement is that testing should happen as part of a comprehensive sleep evaluation with adequate follow-up.
3. You complete a home test or an in-lab study, depending on your health and the question being asked.
4. A sleep physician interprets the results and discusses treatment.
5. If your sleep problem is chronic insomnia, the AASM strongly recommends CBT-I; medication and care for any mood or anxiety disorder may be part of the plan as well.

Insurance rules for sleep testing vary by plan, so ask your plan what it requires before you book.

How psychiatric medications fit in

Several psychiatric medications affect sleep in both directions. Some antidepressants are sedating, others can be activating, and a few are prescribed off-label at low doses for sleep. If you snore or someone has noticed breathing pauses, mention it whenever a sedating medication is discussed; the AASM lists chronic opioid use among the reasons to test in a lab rather than at home. The guide to sleep medications compared sets out the options and their FDA status.

Do not start, stop or change a medication to see whether it is behind your sleep problem. Bring the question to your prescriber, who can weigh the change against your mental health and plan any adjustment safely.

If you are thinking about suicide or are in crisis, call or text 988 (the 988 Suicide & Crisis Lifeline) or go to the nearest emergency room.

Questions to ask your clinician

• Based on my history, does this look like insomnia, a breathing problem, a movement problem, or more than one?
• Would a sleep diary help before we decide on testing?
• If I need a sleep study, is a home test appropriate for me, or do my conditions or medications mean I should go to a lab?
• Who will interpret the study and explain the results?
• Should my iron levels be checked if my legs are restless in the evening?
• Could any of my current medications be affecting my sleep or breathing at night?
• If we start with CBT-I, how will we know if it is working, and when would we reconsider testing?

What the evidence does not show

Two common assumptions do not hold up. The first is that a sleep study is the most thorough way to investigate insomnia; for insomnia alone, it usually adds cost without adding a diagnosis. The second is that a low score on a screening questionnaire rules out apnea; screening tools can miss people, which is why the AASM does not accept them as a diagnosis. If your symptoms suggest apnea, the test answers the question; the questionnaire only helps decide who should take it.

How the practice approaches sleep complaints

Dr. Lewis's team includes psychiatrists, psychiatric nurse practitioners and psychotherapists, and its ongoing care covers psychiatric evaluation, medication management, psychotherapy including CBT, lab testing, and nutrition and lifestyle psychiatry. That makes it a reasonable place to look at sleep alongside mood, anxiety and medications. Sleep studies are run and interpreted through sleep centers, so if apnea or a movement disorder is suspected, ask the team how a referral would be arranged. You can read more on the practice's sleep disorders page or about therapy for sleep problems and CBT-I, and the Choosing Psychiatric Care guide covers other starting points.

Frequently asked questions

Can a fitness tracker or sleep app tell me if I have sleep apnea?

Not on its own. At least one smartwatch sleep apnea notification feature has FDA 510(k) clearance, but it flags possible signs of sleep apnea to discuss with a clinician; it is not a diagnostic sleep study. Sleep apnea is diagnosed with in-lab polysomnography or a home sleep apnea test using a technically adequate device, interpreted by a sleep medicine clinician.

I scored low on STOP-Bang. Does that mean I do not have sleep apnea?

Not necessarily. Screening questionnaires are designed to flag people for testing, and the American Academy of Sleep Medicine does not accept them as a diagnosis. If you still have symptoms such as witnessed pauses in breathing or heavy daytime sleepiness, tell your clinician.

Should I keep a sleep diary before my appointment?

Yes, if you can. One to two weeks of bedtimes, wake times, time to fall asleep, awakenings, naps, caffeine and alcohol gives your clinician far more useful information than a single night's description.

Can a psychiatrist order a sleep study?

Physicians can generally order diagnostic tests, but many psychiatrists refer to a primary care clinician or sleep specialist so that a sleep center can run, interpret and follow up the study. Ask your clinician which route they use.

My insomnia started when I began a new antidepressant. What should I do?

Tell your prescriber. Changes in sleep are a common reason to adjust timing, dose or medication choice, but those changes should be planned with the prescriber rather than made on your own. See mirtazapine vs trazodone for one common comparison.

Is CBT-I available by telehealth?

Many therapists deliver CBT-I by video, and there are also structured digital programs. Ask whether the therapist has specific CBT-I training, since it is a defined protocol rather than general sleep advice.

Sources

1. Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea: An American Academy of Sleep Medicine Clinical Practice Guideline. American Academy of Sleep Medicine, Journal of Clinical Sleep Medicine 13(3):479-504 (Kapur et al.), 2017. aasm.org
2. Clinical Guideline for the Evaluation and Management of Chronic Insomnia in Adults. Journal of Clinical Sleep Medicine 4(5):487-504 (Schutte-Rodin et al., AASM), 2008. pmc.ncbi.nlm.nih.gov
3. Behavioral and psychological treatments for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline. Journal of Clinical Sleep Medicine 17(2):255-262 (Edinger et al.), 2021. pubmed.ncbi.nlm.nih.gov
4. Treatment of restless legs syndrome and periodic limb movement disorder: an American Academy of Sleep Medicine clinical practice guideline. Journal of Clinical Sleep Medicine 21(1):137-152 (Winkelman et al.), 2025. pubmed.ncbi.nlm.nih.gov
5. STOP-Bang Questionnaire: A Practical Approach to Screen for Obstructive Sleep Apnea. Chest 149(3):631-638 (Chung, Abdullah, Liao), 2016. pubmed.ncbi.nlm.nih.gov
6. Insomnia in the Older Adult (Table 1: ICSD-3 chronic insomnia disorder criteria). Sleep Medicine Clinics (Brewster, Riegel, Gehrman), 2017. pmc.ncbi.nlm.nih.gov
7. Apple Watch Series 10 features sleep apnea notifications. American Academy of Sleep Medicine, 2024. aasm.org
8. Restless Legs Syndrome. National Institute of Neurological Disorders and Stroke (NIH), 2026. ninds.nih.gov

Educational information, not medical, tax or legal advice. Decisions about diagnosis, medication and treatment belong with a clinician who knows your history.