Understanding your ESS score
The table below shows the published interpretation bands for the total ESS score, as commonly used in sleep-medicine screening.
| ESS score | Published interpretation |
|---|---|
| 0–7 | Unlikely to be abnormally sleepy |
| 8–9 | Average amount of daytime sleepiness |
| 10–15 | Excessive daytime sleepiness — consider seeking medical advice |
| 16–24 | Severe excessive daytime sleepiness — seeking medical advice is recommended |
- This is a screening instrument, not a diagnostic test; it cannot by itself identify a specific cause of sleepiness such as obstructive sleep apnea or narcolepsy.
- Scores can be influenced by acute factors — a recent poor night, medication, alcohol or shift work — as well as by chronic sleep disorders, so an unusually elevated score is worth interpreting in that context.
- The scale specifically asks about the chance of dozing off, which is a narrower concept than simply feeling tired or fatigued.
- A persistently elevated score, especially in the excessive (10–15) or severe (16–24) range, is a reason to discuss the result with a healthcare professional, who can consider it alongside a full clinical history and, if appropriate, further sleep testing.
What is the Epworth Sleepiness Scale?
The Epworth Sleepiness Scale was developed by Dr. Murray Johns at Epworth Hospital in Melbourne, Australia, and published in 1991 in the journal Sleep as "A new method for measuring daytime sleepiness: the Epworth sleepiness scale." It has since become one of the most widely used self-administered questionnaires in sleep medicine, translated and validated in many languages, and is commonly used as a routine screening step ahead of, or alongside, evaluation for conditions associated with excessive daytime sleepiness, such as obstructive sleep apnea and narcolepsy.
The questionnaire asks a person to rate, on a scale of 0 to 3, their usual chance of dozing off — not simply feeling tired, but actually falling asleep — in eight everyday situations, based on their recent way of life. The eight item scores are summed for a total score ranging from 0 to 24, with higher scores indicating a greater general propensity to doze during passive, low-stimulation activities.
This is a screening instrument, not a diagnostic test. The ESS measures a general tendency to doze in passive situations; it does not identify the specific cause of that tendency, which can range from simple sleep deprivation, shift work or medication effects to conditions such as obstructive sleep apnea or narcolepsy. Clinicians use the ESS score as one input alongside a full clinical history and, where appropriate, objective testing such as polysomnography. Anyone with a persistently raised score — particularly in the excessive or severe range — is encouraged to discuss the result with a doctor rather than self-diagnose.
How to use the Epworth Sleepiness Scale
- For each of the eight situations, choose your usual chance of dozing off in recent times — 0 (would never doze) to 3 (high chance of dozing) — even if you have not been in that exact situation recently, by imagining how it would likely affect you.
- Answer based on your general way of life in recent times, not on one unusual day.
- Read your total score out of 24 and its published interpretation band.
- If your score falls in the excessive (10–15) or severe (16–24) range, or you are concerned about your result, discuss it with a doctor rather than self-diagnosing.
How the ESS score is calculated
The Epworth Sleepiness Scale score is a straightforward sum of the eight item scores, each rated 0 to 3, with no weighting applied to any individual situation.
Common mistakes
- Treating the ESS as a diagnosis — it is a validated screening questionnaire for a general propensity to doze, not a diagnostic test for sleep apnea, narcolepsy or any other specific condition.
- Confusing sleepiness (the tendency to doze off) with general fatigue or tiredness — the ESS specifically asks about the chance of falling asleep in each situation, a narrower and more specific concept.
- Scoring based on a single unusual day rather than a typical recent pattern — the scale is intended to reflect a person's usual way of life in recent times, not one atypical night.
- Dismissing a persistently elevated score because the person has grown used to feeling sleepy — chronic excessive daytime sleepiness is itself a reason to seek medical assessment, regardless of how normal it feels to the person experiencing it.
- Self-treating based on the ESS result alone instead of discussing it with a doctor, who can weigh the score alongside full clinical history and, if needed, objective sleep testing.
常见问题
What is the Epworth Sleepiness Scale used for?
The Epworth Sleepiness Scale (ESS) is a validated 8-item questionnaire used to screen for excessive daytime sleepiness by measuring a person's general chance of dozing off in eight everyday situations. It is commonly used in sleep medicine as an initial screening step, often ahead of or alongside evaluation for conditions such as obstructive sleep apnea and narcolepsy.
Who created the Epworth Sleepiness Scale?
The ESS was developed by Dr. Murray Johns, a sleep physician at Epworth Hospital in Melbourne, Australia, who published the scale in 1991 in the journal Sleep. It has since been validated and translated into many languages and is one of the most widely used self-report sleepiness questionnaires worldwide.
What does an ESS score of 10 or higher mean?
A total score of 10 to 15 falls into the published "excessive daytime sleepiness" range, and 16 to 24 falls into the "severe" range, both of which the scale's published guidance suggests are reasons to consider seeking medical advice. This is a screening indication, not a diagnosis — a doctor can evaluate what might be causing the elevated score.
Can the Epworth Sleepiness Scale diagnose sleep apnea?
No. The ESS screens for a general tendency toward excessive daytime sleepiness but does not identify its cause. An elevated score can result from many factors, including obstructive sleep apnea, narcolepsy, insufficient sleep, shift work or certain medications. Diagnosing a specific sleep disorder requires clinical evaluation by a doctor, and often objective testing such as polysomnography.
How is the Epworth Sleepiness Scale scored?
Each of the eight situations is rated from 0 (would never doze) to 3 (high chance of dozing), based on your usual way of life in recent times. The eight scores are added together for a total ranging from 0 to 24, with published interpretation bands at 0–7, 8–9, 10–15 and 16–24.
What is a normal Epworth score?
A total score of 0 to 7 is described in the published interpretation as unlikely to reflect abnormally high daytime sleepiness, and 8 to 9 is described as an average amount of daytime sleepiness. Scores of 10 and above fall into the excessive or severe ranges, where discussing the result with a doctor is recommended.
What should I do if my Epworth score is high?
A score in the excessive (10–15) or severe (16–24) range is a signal worth discussing with a doctor, who can consider it alongside your full medical history, sleep habits and, if appropriate, further testing. The ESS is a screening aid, not a diagnosis, so a high score on its own does not confirm any specific condition.
参考文献
- Johns MW. A new method for measuring daytime sleepiness: the Epworth sleepiness scale. Sleep 1991; 14(6): 540–545.
- Johns MW. Reliability and factor analysis of the Epworth Sleepiness Scale. Sleep 1992; 15(4): 376–381.
- Kapur VK, Auckley DH, Chowdhuri S, et al. Clinical practice guideline for diagnostic testing for adult obstructive sleep apnea: an American Academy of Sleep Medicine clinical practice guideline. Journal of Clinical Sleep Medicine 2017; 13(3): 479–504.
- Johns MW. About the Epworth Sleepiness Scale. epworthsleepinessscale.com.