Epworth Sleepiness Scale

Screen for excessive sleepiness or follow response to treatment for a sleep disorder

The global unit selector only affects unanswered questions
1.Chance of dozing off while sitting and reading?
2.Chance of dozing off while watching TV?
3.Chance of dozing off while Sitting, inactive in a public place?
4.Chance of dozing off as a passenger in a car for an hour without a break?
5.Chance of dozing off while lying down to rest in the afternoon when circumstances permit?
6.Chance of dozing off while sitting and talking to someone?
7.Chance of dozing off while sitting quietly after lunch without alcohol?
8.Chance of dozing off while in a car, while stopped for a few minutes in traffic?
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1. Chance of dozing off while sitting and reading?

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About this Calculator

This formula, the Epworth Sleepiness Scale (ESS) is taken from Johns (1991), based on the evaluation of 180 patients, including 30 normals and 150 with a variety of sleep disorders. The ESS distinguished patients with sleep disorders from the normal patients in this study. Furthermore, the ESS correlated with the respiratory disturbance index and severity in patients with obstructive sleep apnea (OSA). The ESS was also able to differentiate patients who snored, but had normal sleep, from patients with OSA.

Normal patients had a mean ESS of 5.9, while patients who snored but had no sleep disorder had a mean ESS of 6.5. Patients with periodic limb movement disorder, OSA, narcolepsy, and idiopathic hypersomnia had ESS means of 9.2, 11.7, 17.5, and 17.9 respectively. Standard deviations were between 2.0 and 4.6 for each of these values.


Basner RC.

Continuous positive airway pressure for obstructive sleep apnea.

New England Journal of Medicine 2007 April 26, 356 (17): 1751-8

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