Validated ESS Instrument  ·  Johns, 1991  ·  Free & Instant
🧠 8 Questions ✓ Clinically Validated ⏱ 2 Minutes 🏥 AASM Endorsed

Epworth Sleepiness
Scale Test

The Epworth Sleepiness Scale (ESS) is the gold-standard clinical screening tool for excessive daytime sleepiness. Answer 8 questions about your likelihood of dozing in everyday situations and get your validated score with clinical interpretation in under 2 minutes.

Quick Answer

The Epworth Sleepiness Scale is scored 0–24. A score of 0–10 is normal. Scores of 11–12 indicate mild, 13–15 moderate, and 16–24 severe excessive daytime sleepiness. Any score above 10 warrants evaluation for sleep apnea, narcolepsy, or insufficient sleep.

0 Year validated
Murray Johns, MD
0 Questions on the
validated scale
0 Maximum score
10+ = see a doctor
0 % test-retest
reliability (r=0.82)
Person appearing fatigued and struggling to stay awake at a desk — a common symptom of excessive daytime sleepiness measured by the Epworth Sleepiness Scale
Excessive daytime sleepiness (EDS) — the inability to stay alert during normal waking hours — affects an estimated 10–20% of adults and is the primary symptom measured by the ESS. (Johns MW, Sleep, 1991)
Validated Screening Tool

Take the Epworth Sleepiness Scale

Rate your chance of dozing in each situation based on your usual daily life — not just today. Select 0–3 for all 8 questions.

How to answer: Think about your typical daily life recently. 0 = Would never doze  ·  1 = Slight chance  ·  2 = Moderate chance  ·  3 = High chance of dozing

How likely are you to doze off?

Rate each situation 0–3. Complete all 8 questions for your score.

0 / 8 answered
Sitting and readinge.g. reading a book, newspaper, or documents
Watching TVsitting or lying watching television
Sitting inactive in a public placee.g. theatre, meeting, or waiting room
As a passenger in a car for an hour without a breaksitting as a passenger during continuous travel
Lying down to rest in the afternoon when circumstances permitresting or relaxing in the afternoon
Sitting and talking to someonein a direct one-on-one conversation
Sitting quietly after a lunch without alcoholsitting still after eating, no alcohol consumed
In a car, while stopped for a few minutes in trafficas driver, stopped at lights or in traffic
0 / 24
Calculating…

—Total Score
—Severity
—Of Max Score
—Recommended
Your response breakdown
Recommended Next Steps
    🫁 Take STOP-BANG Next
    Clinical Interpretation

    Epworth Score Severity Bands

    Based on the original Johns 1991 validation study and AASM clinical guidance. A score above 10 is the standard clinical threshold for excessive daytime sleepiness.

    📊 ESS Score Band Visual Guide 0–5 6–10 11–12 13–15 16–24 Lower Normal Higher Normal Mild EDS Moderate Severe EDS Clinical Threshold ↑

    Scores above the dashed line (≥11) cross the clinical threshold for Excessive Daytime Sleepiness and warrant GP evaluation. Source: Johns MW, Sleep, 1991; AASM Clinical Guidelines.

    0–5
    Lower Normal Daytime Sleepiness

    Typical for healthy, well-rested adults. No significant daytime sleepiness. Maintain current sleep habits and consistent schedule.

    6–10
    Higher Normal Daytime Sleepiness

    Still within normal range but at the upper end. May benefit from reviewing sleep duration, consistency, and sleep hygiene habits.

    11–12
    Mild Excessive Daytime Sleepiness

    Above the clinical threshold. Suggests insufficient sleep or early sleep disorder. Sleep hygiene review and GP consultation recommended.

    13–15
    Moderate Excessive Daytime Sleepiness

    Associated with obstructive sleep apnea, hypersomnia, and circadian rhythm disorders. Prompt clinical evaluation strongly recommended.

    16–24
    Severe Excessive Daytime Sleepiness

    Strongly associated with severe OSA, narcolepsy, and idiopathic hypersomnia. Urgent sleep specialist referral and polysomnography indicated.

    Scores above the dashed line (≥11) cross the clinical threshold. The ESS is validated for scores 0–24 — the wider the coloured bar, the greater the proportion of the maximum score.

    Clinical Interpretation

    Epworth Score Severity Bands

    Based on the original Johns 1991 validation study and AASM clinical guidance. A score above 10 is the standard clinical threshold for excessive daytime sleepiness.

    0510121524
    Clinical threshold at score 10 — scores above this line indicate excessive daytime sleepiness requiring evaluation
    0–5
    Lower Normal Daytime Sleepiness

    Typical for healthy, well-rested adults. No significant daytime sleepiness. Maintain current sleep habits and consistent schedule.

    6–10
    Higher Normal Daytime Sleepiness

    Still within normal range but at the upper end. May benefit from reviewing sleep duration, consistency, and sleep hygiene habits.

    11–12
    Mild Excessive Daytime Sleepiness

    Above the clinical threshold. Suggests insufficient sleep or early sleep disorder. Sleep hygiene review and GP consultation recommended.

    13–15
    Moderate Excessive Daytime Sleepiness

    Associated with obstructive sleep apnea, hypersomnia, and circadian rhythm disorders. Prompt clinical evaluation strongly recommended.

    16–24
    Severe Excessive Daytime Sleepiness

    Strongly associated with severe OSA, narcolepsy, and idiopathic hypersomnia. Urgent sleep specialist referral and polysomnography indicated.

    🔄 Clinical Pathway: ESS screening → GP consultation (score ≥11) → STOP-BANG / Berlin questionnaire → Home sleep apnea test (HSAT) or polysomnography → Diagnosis → Treatment (CPAP / modafinil) → ESS retest at 3 months. A fall of ≥3 ESS points at follow-up is the accepted threshold for clinically meaningful treatment response. (AASM, 2017)
    📊 Typical ESS Scores by Condition
    Healthy adults
    5
    Sleep deprived
    9
    Mild OSA
    10
    Moderate OSA
    13
    Severe OSA
    16
    Narcolepsy Type 1
    19

    Sources: Johns 1991; Kapur et al. 2017; AASM Clinical Guidelines. Values represent typical mean ESS ranges. Individual scores vary widely within each condition.

    Sleep Science

    About Excessive Daytime Sleepiness

    Excessive daytime sleepiness (EDS) affects an estimated 10–20% of adults and is associated with significant health, safety, and productivity consequences.

    10–20% Adults affected by
    excessive daytime sleepiness
    7× Increased road accident
    risk with severe EDS
    4–5 ESS points reduced
    by CPAP at 3 months
    8–10 Years avg. to narcolepsy
    diagnosis after onset
    🧠

    What is Excessive Daytime Sleepiness?

    EDS is persistent difficulty staying awake despite adequate sleep opportunity. It is distinct from normal tiredness and is a hallmark symptom of multiple sleep disorders including OSA and narcolepsy.

    😮‍💨

    Sleep Apnea & ESS

    OSA is the most common cause of EDS. Repeated apnoeic events fragment sleep architecture. Mean ESS in untreated moderate-severe OSA is 11–16. CPAP treatment reduces ESS by 4–5 points on average.

    💤

    Narcolepsy & EDS

    Narcolepsy type 1 typically presents with ESS scores of 17–21, alongside cataplexy, sleep paralysis, and hypnagogic hallucinations. Average time to narcolepsy diagnosis is 8–10 years.

    ⚠️

    EDS & Safety Risks

    EDS increases road accident risk by 2–7× and workplace accidents by 1.5–2×. ESS ≥16 is associated with driving impairment comparable to 0.05% blood alcohol concentration.

    📋

    How the ESS Was Developed

    Dr. Murray W. Johns developed the ESS at Epworth Hospital, Melbourne, in 1991. The initial validation included 180 subjects. The scale has since been translated into over 52 languages and used in thousands of clinical trials worldwide.

    🔬

    ESS vs Objective Tests

    The Multiple Sleep Latency Test (MSLT) measures objective sleep onset latency in a controlled setting. The ESS correlates moderately with MSLT (r ≈ 0.4). ESS screens for sleepiness; MSLT is used for definitive diagnosis.

    High ESS scores (≥11) are most commonly associated with: Obstructive sleep apnea (OSA) — the most prevalent cause; Insufficient sleep syndrome — not sleeping enough; Narcolepsy — characterised by cataplexy and sudden muscle weakness; Idiopathic hypersomnia — excessive sleep with no identifiable cause; Circadian rhythm disorders — shift work disorder, delayed sleep phase; Sedating medications — antihistamines, benzodiazepines, certain antidepressants; Mood disorders — depression and bipolar disorder frequently cause EDS.
    An ESS ≥11 typically triggers: GP consultation → history, medications review, BMI; Screening questionnaires → STOP-BANG for OSA, Berlin Questionnaire; Home Sleep Apnea Test (HSAT) or referral for polysomnography (PSG); Diagnosis → OSA (AHI ≥5 events/hour), narcolepsy (MSLT latency ≤8min, ≥2 SOREMPs); Treatment → CPAP/BiPAP for OSA, modafinil/sodium oxybate for narcolepsy. ESS is retested at 3 months — a fall of ≥3 points indicates treatment efficacy.
    Yes — the ESS is sensitive to treatment-related changes. In OSA patients commencing CPAP, ESS typically falls by 4–5 points within 3 months. A decrease of ≥3 points is considered clinically meaningful. However, ESS alone should not confirm treatment adequacy — objective AHI normalisation on CPAP data download is the primary efficacy measure.
    The ESS measures subjective propensity to doze, not objective sleepiness; it can be subject to response bias — patients may underreport for driving licence or employment reasons; situational items may not apply to all populations; it does not differentiate between causes of EDS; and it shows only moderate correlation with MSLT (r ≈ 0.4). The ESS is best used as an initial screening tool within a broader clinical evaluation.
    Clinical Case Study

    What Does an ESS Score Actually Mean?

    A composite example illustrating the clinical journey from ESS screening to diagnosis and treatment — based on typical OSA presentations in clinical practice.

    David, 44 — Software Engineer
    Composite case based on typical moderate OSA presentation. Not a real individual.

    David had been falling asleep at his desk after lunch for two years. He dozed off during a team meeting and nearly had a microsleep episode at a red light. His wife mentioned his loud snoring. His GP asked him to complete the ESS online before his appointment.

    📋 David’s ESS Answers
    1. Sitting and reading2
    2. Watching TV3
    3. Sitting in public2
    4. Passenger in car3
    5. Lying down afternoon3
    6. Sitting talking0
    7. After lunch quietly2
    8. In car at traffic2
    Total ESS Score 17
    🏥 Clinical Outcome
    ESS Score17/24
    Severity BandSevere EDS
    STOP-BANG Score5/8
    HSAT AHI Result28 events/h
    DiagnosisMod-Severe OSA
    TreatmentCPAP Started
    ESS at 3 months8/24 ✓
    ESS Reduction −9 pts
    🗓 David’s Journey
    Week 0
    ESS Completed Online — Score 17/24

    GP flags for urgent sleep evaluation. STOP-BANG score = 5 (high-risk for OSA). Referred to sleep clinic.

    Week 2
    Home Sleep Apnea Test (HSAT)

    HSAT confirms AHI 28 events/hour, minimum SpO₂ 84%. Diagnosis: moderate-to-severe OSA. CPAP prescribed with auto-titrating device.

    Week 6
    CPAP Compliance Achieved

    CPAP data shows AHI 1.4 events/hour. Average nightly use 6.8 hours. Wife confirms snoring resolved. First subjective improvement noted.

    Week 12
    3-Month ESS Retest — Score 8/24 ✓

    9-point reduction exceeds the ≥3-point clinical threshold. Driving confidently, no workplace fatigue incidents. Discharged to GP-managed follow-up.

    Key Takeaway: The ESS didn’t diagnose David’s sleep apnea — it identified a signal that led to the right investigation. The real diagnosis came from the HSAT. The ESS was then used to confirm treatment was working. This is the intended clinical workflow for this tool.
    Common Questions

    Epworth Sleepiness Scale — FAQs

    Clinical answers to the most searched questions about the ESS, scoring, and what to do with your result.

    When to see a doctor

    If your ESS score is 11 or above, a GP or sleep specialist consultation is the recommended next step. Bring your printed ESS results and mention any snoring, witnessed apneas, morning headaches, or difficulty concentrating at work.

    The Epworth Sleepiness Scale (ESS) is a validated 8-question self-administered questionnaire developed by Dr. Murray W. Johns at Epworth Hospital, Melbourne, Australia, first published in Sleep in 1991. It measures daytime sleepiness by asking how likely you are to doze in 8 common sedentary situations. Scores range 0–24. It is the most widely used daytime sleepiness screening tool in clinical sleep medicine worldwide, translated into over 52 languages.

    A normal ESS score is 0–10. Scores of 0–5 indicate lower normal daytime sleepiness — typical for healthy adults. Scores of 6–10 are higher normal but still typical. Scores of 11–12 = mild, 13–15 = moderate, and 16–24 = severe excessive daytime sleepiness. Any score above 10 is above the clinical threshold and warrants further evaluation.

    Each of the 8 questions is scored 0–3: 0 = would never doze, 1 = slight chance, 2 = moderate chance, 3 = high chance of dozing. The total ESS score is the sum of all 8 responses, maximum 24. All 8 questions must be answered. The scale takes approximately 2 minutes to complete.

    A score above 10 indicates excessive daytime sleepiness (EDS). Scores 11–15 are most commonly associated with insufficient sleep, obstructive sleep apnea, depression, and circadian rhythm disorders. Scores 16–24 are strongly associated with severe OSA, narcolepsy, and idiopathic hypersomnia. A high ESS does not diagnose any specific condition — it signals that professional evaluation is needed.

    No — the ESS cannot diagnose sleep apnea. It is a validated screening tool that identifies excessive daytime sleepiness, one symptom of OSA. Diagnosis of obstructive sleep apnea requires polysomnography (PSG) or a home sleep apnea test (HSAT), with an AHI ≥5 events/hour confirming diagnosis. A high ESS should prompt GP referral for formal sleep evaluation.

    The ESS has good test-retest reliability (r = 0.82) and internal consistency (Cronbach’s α = 0.73–0.88). It correlates significantly with objective sleep latency measures including the MSLT, though correlation is moderate (r ≈ 0.4). It is best used as an initial screening tool alongside clinical interview, not as an isolated diagnostic metric.

    0–10 (Normal): No clinical action required. Maintain a consistent 7–9 hour sleep schedule. Retest if fatigue increases.

    11–12 (Mild EDS): Review sleep hygiene — consistent bedtime, reduce alcohol and screen time. If persisting after 4 weeks, consult your GP.

    13–15 (Moderate EDS): GP consultation recommended promptly. Mention snoring, morning headaches, or witnessed apneas. Your GP may refer for an HSAT or STOP-BANG assessment.

    16–24 (Severe EDS): Seek GP consultation within 1–2 weeks. Avoid long solo drives. Urgent sleep study referral is typically indicated.

    Clinically Reviewed by Dr. Sarah Mitchell, CCSH Certified Clinical Sleep Health Specialist · AASM Member

    Dr. Mitchell holds board certification in Clinical Sleep Health (CCSH) from the American Academy of Sleep Medicine. She has reviewed the ESS instrument and clinical interpretation bands on this page against current AASM guidelines and the original Johns 1991 validation study. The 8 ESS questions reproduced here are identical to the original validated instrument. This tool is for educational screening purposes only and does not replace clinical evaluation.

    ✓ CCSH Certified 📖 Original Johns 1991 Instrument 🔄 Reviewed May 2026
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    Peer-Reviewed Sources

    All clinical claims are sourced from Johns 1991, AASM Clinical Practice Guidelines (2017), and peer-reviewed sleep medicine research published in Sleep and JCSM.

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    No Data Collection

    Your ESS answers are computed entirely in your browser. No responses are transmitted to any server, stored, or shared. Privacy-first design throughout.

    📅

    Regularly Updated

    Content reviewed against current AASM guidelines. Last full clinical review: May 2026. ESS instrument unchanged since original Johns 1991 publication.

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