Epworth Sleepiness Scale (ESS) Calculator

questionnaire

Sitting and reading

Watching TV

Sitting inactive in a public place (e.g., theatre, meeting)

As a passenger in a car for an hour without a break

Lying down to rest in the afternoon

Sitting and talking to someone

Sitting quietly after lunch without alcohol

In a car, while stopped for a few minutes in traffic

✓ when to use

Use in patients with suspected sleep disorders (OSA, narcolepsy, idiopathic hypersomnia), to monitor CPAP treatment response, and in driving fitness assessments. Useful alongside STOP-Bang for comprehensive sleep evaluation.

✗ when not to use

ESS measures subjective sleepiness, which may not correlate with objective sleepiness (measured by MSLT). Patients may underreport sleepiness due to habituation or driving licence concerns. ESS does not diagnose the cause of sleepiness. Not validated in children.

clinical pearls

An ESS ≥10 should prompt evaluation for sleep disorders. The most common cause is OSA, but also consider insufficient sleep syndrome, narcolepsy, medications (sedatives, antihistamines), and depression.
In driving fitness assessments, an ESS ≥10 is a red flag. In the UK, DVLA regulations require patients with excessive sleepiness to stop driving until satisfactorily treated. Document ESS and driving advice in the clinical record.
ESS is subjective — patients may underreport sleepiness if they fear losing their driving licence or employment. Clinical judgement and collateral history (bed partner observations) add important context.
Monitor ESS before and after CPAP initiation. A ≥4-point improvement is clinically meaningful and indicates treatment benefit. Persistent sleepiness despite CPAP should prompt reassessment of adherence, pressure settings, or alternative diagnoses.
ESS specifically measures the propensity to doze, not fatigue. A patient can be fatigued (low energy, exhaustion) without being sleepy (falling asleep). These are different constructs with different differential diagnoses.

related tools

stop-bangOSA screening (complementary)

✓ when to use

✗ when not to use

clinical pearls

An ESS ≥10 should prompt evaluation for sleep disorders. The most common cause is OSA, but also consider insufficient sleep syndrome, narcolepsy, medications (sedatives, antihistamines), and depression.
In driving fitness assessments, an ESS ≥10 is a red flag. In the UK, DVLA regulations require patients with excessive sleepiness to stop driving until satisfactorily treated. Document ESS and driving advice in the clinical record.
ESS is subjective — patients may underreport sleepiness if they fear losing their driving licence or employment. Clinical judgement and collateral history (bed partner observations) add important context.
Monitor ESS before and after CPAP initiation. A ≥4-point improvement is clinically meaningful and indicates treatment benefit. Persistent sleepiness despite CPAP should prompt reassessment of adherence, pressure settings, or alternative diagnoses.
ESS specifically measures the propensity to doze, not fatigue. A patient can be fatigued (low energy, exhaustion) without being sleepy (falling asleep). These are different constructs with different differential diagnoses.

related tools

stop-bangOSA screening (complementary)