Sleep Tools
Epworth Sleepiness Scale Calculator
Rate how likely you are to doze off in eight everyday situations and get your total ESS score.
Answer each situation
Use the 0-3 scale to describe your likelihood of dozing off.
1. Sitting and reading
2. Watching TV
3. Sitting inactive in a public place
4. As a passenger in a car for an hour without a break
5. Lying down to rest in the afternoon
6. Sitting and talking to someone
7. Sitting quietly after lunch without alcohol
8. In a car while stopped in traffic
Your score
0
/ 24Answer all eight questions to interpret the score more confidently.
Frequently Asked Questions
Learn what the Epworth scale measures and how to interpret the score.
What is Excessive Daytime Sleepiness?
Excessive daytime sleepiness (EDS) is the chronic inability to stay awake and alert during the day, despite adequate opportunity for sleep. It is one of the most common and most underreported symptoms of sleep disorders, particularly obstructive sleep apnea (OSA). When OSA causes repeated breathing disruptions throughout the night, sleep becomes fragmented and non-restorative, leaving the brain in a perpetual state of fatigue.
The consequences extend well beyond feeling tired. EDS impairs concentration, memory, and reaction time. Drowsy driving is a factor in an estimated 5x higher crash risk. At work, EDS reduces productivity and increases the likelihood of errors. Addressing the underlying cause, often OSA, typically reverses sleepiness within weeks.
Key Fact
The NTSB estimates drowsy driving causes 100,000 crashes and 1,500 deaths annually in the U.S.
How the Epworth Sleepiness Scale Works
The ESS was developed by Dr. Murray Johns at Epworth Hospital in Melbourne, Australia, in 1991. It has since been validated across 18+ languages and is used in over 100 countries as the standard subjective measure of daytime sleepiness.
Score Interpretation
| Score Range | Classification | Recommended Action |
|---|---|---|
| 0–10 | Normal | Monitor; maintain good sleep hygiene |
| 11–12 | Mild sleepiness | Track with a sleep diary; consider lifestyle factors |
| 13–15 | Moderate sleepiness | Consult a physician; evaluate for sleep disorders |
| 16–24 | Severe sleepiness | Seek prompt clinical evaluation; avoid driving when fatigued |
Conditions Associated with High ESS Scores
A high ESS score is not a diagnosis. It is a flag that warrants evaluation. These are the most common conditions associated with clinically elevated daytime sleepiness.
Obstructive Sleep Apnea
The most common cause of EDS in adults. Repeated apnea events fragment deep sleep, leaving the brain sleep-deprived regardless of total time in bed. CPAP therapy typically reduces ESS scores by 3–5 points.
Insomnia
Chronic difficulty falling or staying asleep accumulates as sleep debt. Even when the primary complaint is difficulty sleeping, daytime sleepiness often coexists and compounds functional impairment.
Narcolepsy
A neurological disorder affecting the brain's ability to regulate sleep-wake cycles. Characterized by sudden, uncontrollable sleep attacks, cataplexy, and sleep paralysis. ESS scores are typically very high (16+).
Shift Work Disorder
Working non-traditional hours misaligns the body's circadian rhythm with the sleep schedule. The resulting circadian disruption produces excessive sleepiness during work hours and poor sleep during available rest periods.
ESS vs STOP-BANG: Two Tools, Two Questions
The ESS and STOP-BANG screen for different dimensions of sleep apnea risk. Used together, they give clinicians and patients a much clearer picture.
ESS
"How sleepy ARE you?"
Measures current daytime impairment. Captures how OSA (or another disorder) is affecting your waking life right now. Useful for monitoring treatment response over time.
STOP-BANG
"How likely do you have OSA?"
Measures structural and physiological risk factors, including anatomy, age, BMI, blood pressure. Identifies who is at risk before symptoms become severe.
Best practice: Use both together. A high ESS score combined with a high STOP-BANG score significantly strengthens the case for a sleep study.
Tracking treatment: ESS is also used to measure treatment response. Effective CPAP therapy typically reduces ESS scores by 3–5 points within the first few months.
Key Takeaways
- ESS is the most widely used validated tool for measuring daytime sleepiness.
- Scores above 10 indicate sleepiness worth discussing with a healthcare provider.
- High ESS alone doesn't diagnose a sleep disorder. It's a flag for evaluation.
- OSA is the most common cause of excessive daytime sleepiness in adults.
- Effective treatment (CPAP, lifestyle) typically reduces ESS score by 3–5 points.
References
- Johns MW. "A New Method for Measuring Daytime Sleepiness: The Epworth Sleepiness Scale." Sleep. 1991.
- Johns MW. "Reliability and Factor Analysis of the Epworth Sleepiness Scale." Sleep. 1992.
- Masa JF, et al. "Validity of the International Classification of Sleep Disorders for diagnosing obstructive sleep apnea." Thorax. 2011.
- Arand D, et al. "The clinical use of the MSLT and MWT." Sleep. 2005.