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Karolinska Sleepiness Scale (KSS)

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Supplemental: Parkinson's Disease (PD)
Short Description of Instrument
The Karolinska Sleepiness Scale (KSS) is a self-report scale that measures the subject's drowsiness and is frequently used in studies measuring subjective sleepiness.
It is a 9-point verbally anchored scale going from 'extremely alert' to 'extremely sleepy-fighting sleep'.
Akerstedt T, Gillberg M. Subjective and objective sleepiness in the active individual. Int J Neurosci 1990;52:29-37.
Kaida K, Takahashi M, Åkerstedt T, Nakata A, Otsuka Y, Haratani T, Fukasawa K. Validation of the Karolinska sleepiness scale against performance and EEG variables. Clinical Neurophysiology 2006;117:1574-1581.


Document last updated June 2018