ABSTRACT
All patients who present with a sleep disorder for investigation and treatment require some assessment of their daytime sleepiness. Excessive daytime sleepiness (EDS) is one of their most common and important symptoms, i.e. ‘sleepiness in a situation when an individual would be expected to be awake and alert’.1
Indeed, it may not be asking too much to include an assessment of EDS in all comprehensive medical examinations. However, the best way to make that assessment is still a matter for debate.2-4 Many different methods have been proposed, some based on objective measurements, others on subjective reports.5
