The Epworth Sleepiness Scale Explained
The Epworth Sleepiness Scale is an eight-question quiz that rates how likely you are to doze off in everyday situations. Scores run from 0 to 24, and a score over 10 suggests excessive daytime sleepiness. It screens for a problem worth raising with your GP. It cannot diagnose anything.
If you keep nodding off during the day, the Epworth Sleepiness Scale is one way to put a number on it. It is quick, free and widely used in UK sleep clinics. Here is what it actually measures and where it stops.
What is the Epworth Sleepiness Scale?
The Epworth Sleepiness Scale (ESS) is a short questionnaire about daytime sleepiness. It lists eight everyday situations and asks how likely you would be to fall asleep in each one, not just feel tired.
You rate each situation from 0 to 3:
- 0: would never doze
- 1: slight chance of dozing
- 2: moderate chance of dozing
- 3: high chance of dozing
The eight situations include sitting and reading, watching television, sitting quietly after lunch, and being a passenger in a car for an hour. Add the eight answers together for a total between 0 and 24.
What does a score over 10 mean?
A total above 10 points to excessive daytime sleepiness. The higher the number, the stronger the signal that your daytime alertness is being affected by something.
| ESS score | What it suggests |
|---|---|
| 0 to 10 | Normal daytime sleepiness |
| Over 10 | Excessive daytime sleepiness worth discussing |
A high score does not name a cause. Poor sleep, shift work, certain medicines and conditions like obstructive sleep apnoea can all push the number up. If your score is over 10, or you feel tired after a full night’s sleep, that is a good reason to see your GP.
Can the Epworth scale diagnose sleep apnoea?
No. The ESS is a screening tool, not a test. It measures how sleepy you feel, which is only one symptom of obstructive sleep apnoea. NICE specifically warns against using the Epworth score on its own to decide whether someone should be referred.
Only a sleep study can diagnose sleep apnoea and grade its severity. Clinicians often combine the ESS with other questions, such as the STOP-Bang questionnaire, and with what they observe overnight. If you snore loudly or have noticed signs of sleep apnoea, bring those details too.
It can help to arrive with a record of your nights. Kip tracks your snoring loudness and frequency over time, entirely on your iPhone, so you have a clearer picture to share rather than a vague “I think I snore”. It measures patterns, not conditions, and it never claims to find apnoea.
Sources
- NICE NG202: Obstructive sleep apnoea/hypopnoea syndrome
- Sleep Foundation: Epworth Sleepiness Scale
- NHS: Sleep apnoea
FAQ
Is the Epworth Sleepiness Scale accurate?
It is a reliable measure of how sleepy you feel day to day, and it is used routinely in UK sleep clinics. But it reflects your own perception, so two people can answer differently. It is a starting point for a conversation, not a definitive result.
What is a normal Epworth score?
A total of 0 to 10 is generally treated as normal daytime sleepiness. Above 10 suggests excessive sleepiness worth looking into. Numbers in the high teens or low twenties suggest stronger sleepiness and are worth raising promptly with your GP.
Should I see a GP if my Epworth score is high?
Yes, especially if you also snore heavily, wake gasping, or have been told your breathing pauses in your sleep. A high score plus those signs is a sensible reason to book an appointment. Your GP can decide whether a sleep study is needed.