Epworth Sleepiness Scale:
what your score means
Understand how the daytime sleepiness questionnaire works, how to interpret your score, and why it cannot diagnose or rule out sleep apnea.
What is the Epworth Sleepiness Scale?
The Epworth Sleepiness Scale (ESS) is an eight-question assessment of how likely you are to doze during everyday activities. Each answer contributes to a total between 0 and 24. It gives you and your clinician a consistent way to describe daytime sleepiness. [1]
It is a self-report questionnaire: your answers reflect your experience. It does not record sleep, oxygen levels, or breathing interruptions. Research supports its use as a measure of sleepiness, but it is only one part of an evaluation. [2]
How to answer the questionnaire
Think about your usual chance of falling asleep in the situations described. The questions concern dozing, rather than simply feeling worn out. Give the answer that best represents your experience and follow the instructions in the questionnaire.
- 0: No chance of dozing
- 1: A slight chance
- 2: A moderate chance
- 3: A high chance
The eight ratings are added together. A higher total reflects a greater reported tendency to doze. These are the standard response choices and scoring method described by the American Thoracic Society. [1]
If a situation is unfamiliar or you are unsure how to answer, tell your care team. The goal is an honest description that helps the conversation.
What does your Epworth score mean?
| Total score | Daytime sleepiness range |
|---|---|
| 0–10 | Within the normal reference range |
| 11–12 | Mild excessive daytime sleepiness |
| 13–15 | Moderate excessive daytime sleepiness |
| 16–24 | Severe excessive daytime sleepiness |
These labels describe sleepiness—not mild, moderate, or severe sleep apnea. A score above 10 is a reason to discuss excessive sleepiness with a clinician; it is not a diagnosis or a treatment prescription. [1] [3]
Sleepiness and fatigue are different
Sleepiness means a tendency to fall asleep. Fatigue can feel more like low energy or exhaustion, even when you do not expect to doze. The NHS distinguishes excessive daytime sleepiness from feeling tired all the time. [4]
For your appointment, describe both experiences in your own words. “I fall asleep while sitting quietly” and “I feel exhausted but stay awake” give your clinician different information. Persistent symptoms still deserve attention even if a questionnaire does not capture them well.
Can the Epworth scale diagnose sleep apnea?
No. A low Epworth score does not rule out obstructive sleep apnea (OSA), and a high score does not prove you have it. NICE specifically advises against using Epworth alone to decide whether a referral is needed, because not everyone with OSA has excessive sleepiness. [5]
The American Academy of Sleep Medicine recommends that questionnaires and prediction tools not be used to diagnose adult OSA without a sleep study. [3] Your medical provider considers your symptoms and history and may recommend home or laboratory testing. [6]
Epworth scores and sleep-study measurements answer different questions. Epworth describes reported sleepiness. Sleep testing evaluates breathing during sleep and helps establish the diagnosis and its severity. Read what OSA is and how to understand sleep study results. [6]
When to discuss sleepiness with a clinician
Seek an evaluation if you often fall asleep during the day or sleepiness affects your daily life. Possible contributors include sleep disorders, some medicines, alcohol, and other health conditions; the questionnaire cannot distinguish among them. [4]
Bring your score, examples of when you doze, your sleep schedule, and a list of medicines to the appointment. A sleep diary can help show how long and how well you sleep and how sleepy you feel during the day. [6]
Do not drive when you feel too sleepy to drive safely. If drowsiness starts while driving, pull over somewhere safe. A questionnaire score is not clearance to drive, and coffee alone may not prevent brief episodes of sleep. [7]
How is Epworth used during follow-up?
Your clinician may repeat the questionnaire to follow changes in reported sleepiness. The scale is used in clinical care and research to assess this symptom over time. [2]
Feeling more alert is useful information, but it does not by itself confirm that breathing interruptions are controlled. Continue prescribed treatment and discuss symptoms and any recommended follow-up testing with your medical provider. [3] Learn about living with sleep apnea treatment.
Common questions
Is an Epworth score of 10 normal?
Does a high score mean I need CPAP?
No. The score does not establish a diagnosis or select a treatment. Your medical evaluation and any indicated sleep testing guide those decisions. [3]
Can I have sleep apnea without feeling sleepy?
Yes. NICE notes that not everyone with obstructive sleep apnea has excessive sleepiness. Tell your clinician about snoring, observed breathing pauses, and other concerns even if your Epworth score is low. [5]
Sources & further reading
Sources checked October 19, 2026. This source-check date is not a clinical review date.
- American Thoracic Society — Epworth Sleepiness Scale (ESS)
- Lapin et al. (2018) — ESS validation study, NIH PubMed Central
- American Academy of Sleep Medicine — Diagnostic testing guideline for adult OSA
- NHS — Excessive daytime sleepiness
- NICE NG202 — Assessment scales for suspected OSA, recommendations 1.1.3–1.1.4
- National Heart, Lung, and Blood Institute — Sleep apnea diagnosis
- National Highway Traffic Safety Administration — Drowsy driving
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