The Epworth sleepiness scale originally evaluates the level of a person's daytime sleepiness based on the likelihood of dozing in eight different sedentary situations, and is used to help diagnose hypersomnia or sleep-disordered breathing such as obstructive sleep apnea. Each of the eight questions is rated on a four point Likert scale ranging from 0 (no chance of falling asleep) to 3 (high chance of falling asleep) with a maximum total score of 24. While there has been noted a considerable overlap among scores and the chance of sleep-disordered breathing, it has been shown that a score of ≥10 highly correlates with the presence of severe obstructive sleep apnea.