EPWORTH SLEEPINESS SCALE
The Epworth Sleepiness Scale (ESS) was developed and validated
by Dr. Murray Johns of Melbourne, Australia. It is a simple,
self-administered questionnaire which is widely used by sleep
professionals in quantifying the level of daytime sleepiness.
(Johns MW. A new method for measuring daytime sleepiness:
The Epworth Sleepiness Scale. Sleep 1991; 14(6):540-5)