Epworth Sleepiness Scale (ESS) Flow

Epworth Sleepiness Scale flow


The Epworth Sleepiness Scale (ESS) is a self-administered questionnaire with 8 questions. Respondents are asked to rate, on a 4-point scale (0-3), their usual chances of dozing off or falling asleep while engaged in eight different activities. Most people engage in those activities at least occasionally, although not necessarily every day.  The ESS for adults was developed in 1990 [1] and subsequently slightly modified in 1997 [2,3].

The Epworth Sleepiness Scale flow contains the Epworth Sleepiness Scale (ESS) questionnaire and associated calculation. After form submission, the Epworth Sleepiness Scale calculation is executed automatically. It's easy to extend this flow with conditional logic based on the interpretation of the Epworth Sleepiness Scale calculation.

Epworth Sleepiness Scale (ESS) questionnaire

Questions and Scoring

The ESS has 8 questions which are all scored on a 0-3 scale:

  • 0 = would never doze
  • 1 = slight chance of dozing
  • 2 = moderate chance of dozing
  • 3 = high chance of dozing


The higher the ESS score, the higher that person’s average sleep propensity in daily life (ASP), or their ‘daytime sleepiness’.

In general ESS scores can be interpreted as follows:

Score range Interpretation
[0,5] Lower Normal Daytime Sleepiness
[6,0] Higher Normal Daytime Sleepiness
[11,12] Mild Excessive Daytime Sleepiness
[13,15] Moderate Excessive Daytime Sleepiness
[16,24] Severe Excessive Daytime Sleepiness


[1] Johns MW. A new method for measuring daytime sleepiness: the Epworth sleepiness scale. Sleep. 1991 Dec;14(6):540-5. doi: 10.1093/sleep/14.6.540. PMID: 1798888.\
[2] Johns M, Hocking B. Daytime sleepiness and sleep habits of Australian workers. Sleep. 1997 Oct;20(10):844-9. doi: 10.1093/sleep/20.10.844. PMID: 9415943.

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