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The Epworth Sleepiness Scale (ESS) is a widely used, validated self-assessment questionnaire that measures a person's general level of daytime sleepiness. Developed by Dr. Murray Johns at the Epworth Hospital in Melbourne, Australia in 1991, the ESS has become the standard screening tool for excessive daytime sleepiness in clinical sleep medicine and is used in the evaluation of conditions including obstructive sleep apnea, narcolepsy, idiopathic hypersomnia, and shift work sleep disorder.
The scale asks respondents to rate their likelihood of dozing off in eight common everyday situations on a 4-point scale from 0 (no chance of dozing) to 3 (high chance of dozing). These situations range from passive activities where sleepiness is common (lying down to rest in the afternoon) to active situations where dozing would be highly abnormal (talking to someone, stopped in traffic). The total score ranges from 0 to 24, with higher scores indicating greater daytime sleepiness.
A score of 0–5 is considered lower normal daytime sleepiness. Scores of 6–9 represent higher normal sleepiness. Scores of 10–15 indicate mild-to-moderate excessive daytime sleepiness, warranting further evaluation for underlying sleep disorders. Scores of 16–24 indicate severe excessive daytime sleepiness that significantly impacts daily functioning and safety, particularly driving safety, and requires urgent evaluation and treatment.
The ESS is valued for its simplicity, taking only about 2 minutes to complete, and its ability to capture the propensity for sleepiness across varied situations. It has been translated into numerous languages and validated across diverse populations. This calculator provides automated ESS scoring with clinical interpretation to support screening for sleep disorders and monitoring treatment response.
The Epworth Sleepiness Scale asks the respondent to rate their chance of dozing (0 = no chance, 1 = slight, 2 = moderate, 3 = high) in eight situations:
Total score = sum of all eight items (range 0–24). Interpretation: 0–5 = Lower normal sleepiness; 6–9 = Higher normal sleepiness; 10–15 = Mild to moderate excessive sleepiness; 16–24 = Severe excessive sleepiness.
A score of 0–5 indicates normal alertness — no further evaluation for sleepiness is typically needed. Scores of 6–9 are within the upper range of normal but should be considered in clinical context. Scores of 10–15 suggest excessive daytime sleepiness that warrants investigation for conditions like obstructive sleep apnea, narcolepsy, or insufficient sleep. Scores of 16–24 indicate severe excessive sleepiness with significant safety implications (especially driving risk) requiring urgent sleep evaluation and treatment.
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Results
ESS = 6 — higher normal range. No significant excessive sleepiness.
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Results
ESS = 21 — severe excessive daytime sleepiness. Urgent sleep evaluation needed.
The ESS is an 8-item self-report questionnaire that measures general daytime sleepiness by asking respondents to rate their likelihood of dozing in eight common situations, producing a score from 0 to 24.
A score of 10 or higher is generally considered to indicate excessive daytime sleepiness that warrants further evaluation. Scores of 16 or higher indicate severe excessive sleepiness.
No. The ESS screens for excessive daytime sleepiness but does not diagnose any specific condition. A high ESS score should prompt further evaluation (such as a sleep study) to determine the underlying cause.
Yes. The ESS is commonly used to track changes in daytime sleepiness before and after treatment for conditions like obstructive sleep apnea (with CPAP), narcolepsy (with medications), or other sleep disorders.
Scores of 0–9 are considered normal, with 0–5 being lower normal and 6–9 being higher normal. The mean ESS score in normal healthy adults is approximately 5–6.
Higher ESS scores, particularly above 15, are associated with increased risk of drowsy driving and motor vehicle accidents. However, the ESS alone should not be used as the sole predictor of driving safety.
The ESS was developed and primarily validated in adults. Modified versions exist for adolescents. It is less reliable in elderly populations where daytime napping may be culturally normal.
Yes. Sedating medications (antihistamines, benzodiazepines, opioids) can increase ESS scores, while stimulants can decrease them. Medication status should be considered when interpreting results.
The ESS is typically reassessed at follow-up visits after initiating treatment for a sleep disorder, commonly at 1–3 month intervals, to evaluate treatment effectiveness.
Common causes include obstructive sleep apnea, narcolepsy, idiopathic hypersomnia, insufficient sleep syndrome, shift work disorder, medication side effects, and depression.
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