What does an Epworth Sleepiness Scale score of 13 indicate and how should it be managed?

Epworth Score 13: Moderate Excessive Daytime Sleepiness Requiring Evaluation

An Epworth Sleepiness Scale (ESS) score of 13 indicates moderate excessive daytime sleepiness that warrants clinical investigation for underlying sleep disorders, particularly obstructive sleep apnea (OSA), and should prompt screening with the STOP questionnaire followed by objective sleep testing if positive.

What This Score Means

An ESS score of 13 falls above the threshold of 10, which distinguishes normal individuals from those with pathological sleepiness 1. This level of sleepiness:

• Significantly increases risk for motor vehicle crashes, particularly on monotonous roads 2
• Correlates with impaired memory, concentration, and coordination 3
• May indicate underlying OSA, narcolepsy, idiopathic hypersomnia, or other sleep disorders 4
• Affects approximately 23% of the general population when using the ESS > 10 cutoff 5

Important caveat: While the ESS has good internal consistency (Cronbach's alpha 0.73-0.86), individual scores can vary considerably on repeat testing, with limits of agreement ranging from -6.7 to +7.5 points 6, 7. However, when classified as "sleepy" (≥11) versus "normal" (<11), 89% of patients remain in the same category on retesting 6.

Immediate Clinical Actions

1. Screen for Obstructive Sleep Apnea

Use the STOP questionnaire 8, which asks 4 yes/no questions:

• Snoring loudly
• Tiredness, fatigue, or sleepiness during daytime
• Observed apneas during sleep
• Pressure (high blood pressure)

A score ≥2 indicates high risk for OSA and requires objective testing 8.

2. Order Appropriate Sleep Testing

• If STOP ≥2: Order home sleep apnea testing (HSAT) with manually scored type III monitor OR in-laboratory polysomnography (PSG) 8
• If symptoms suggest narcolepsy (cataplexy, frequent short naps, vivid dreams, sleep paralysis): Refer for overnight PSG followed by Multiple Sleep Latency Test (MSLT) 4
• If HSAT is nondiagnostic or shows AHI <5: Repeat with either HSAT or in-laboratory PSG 8

3. Evaluate for Other Causes

Check for:

• Restless legs syndrome: Uncomfortable leg sensations worse at night, relieved by movement; check ferritin (treat if <45-50 ng/mL) 4
• Insufficient sleep: Directly ask about total sleep time and sleep opportunity 3
• Medications: Review for stimulating agents (sympathomimetics, bronchodilators, stimulating antidepressants) or sedating medications taken during the day 3
• Medical conditions: Parkinson's disease, hypothyroidism, depression, chronic pain 3

Management Based on Findings

If OSA is Diagnosed (AHI ≥5 or respiratory event index ≥15 on HSAT)

First-line treatment: Continuous Positive Airway Pressure (CPAP) 9, 4

• CPAP is superior to oral appliances in reducing AHI and improving outcomes 9
• Use for the entirety of sleep period 8
• Provide supportive, educational, and behavioral interventions early to improve adherence 8
• Continue CPAP even if used <4 hours/night while working on adherence 8

Alternative for CPAP-intolerant patients: Custom, titratable oral appliances 9

• Only if prescribed by sleep physician and fitted by qualified dentist 9
• Custom, titratable appliances reduce ESS scores moderately and are not inferior to CPAP for subjective sleepiness 9
• Contraindicated if <8 healthy teeth in upper and lower jaws 3

Adjunctive measures:

• Weight loss and exercise 4
• Avoid alcohol and opioids/sedative-hypnotics near bedtime 8

If No OSA but Persistent Sleepiness

Implement sleep hygiene education 4:

• Regular morning/afternoon exercise
• Daytime bright light exposure
• Dark, quiet, comfortable sleep environment
• Avoid heavy meals, alcohol, nicotine near bedtime
• Consistent sleep-wake schedule

Consider physical activity interventions: Exercise and yoga have been shown to improve sleep quality and daytime functioning 4

If Narcolepsy or Idiopathic Hypersomnia Suspected

Refer to sleep specialist 3 for:

• Confirmation via PSG and MSLT
• Pharmacologic management (modafinil, sodium oxybate for narcolepsy with cataplexy)
• Ongoing monitoring with ESS at each visit 3

Monitoring Response to Treatment

Use the ESS as a monitoring tool 3:

• With effective treatment (CPAP or oral appliances), expect ESS reduction of ≥2 points 9, 3
• Reassess ESS at each follow-up visit
• If sleepiness returns or worsens, repeat objective testing 3

Critical Safety Consideration

Address driving risk immediately 2:

• ESS scores >10 are associated with increased motor vehicle crash risk
• Counsel patient about drowsy driving dangers
• Document discussion in medical record
• Be aware of state-specific reporting requirements for high-risk drivers

When to Refer to Sleep Specialist

Refer when 3:

• Narcolepsy or idiopathic hypersomnia suspected
• Cause of sleepiness remains unknown after initial evaluation
• Patient unresponsive to initial therapy
• Uncertain OSA diagnosis or challenging treatment scenarios