Karolinska Sleepiness Scale.
KSS
Momentary subjective sleepiness or alertness at a given point in time
- Provisionally grouped under
- Length and format
- 1 item. single 9-point verbally anchored scale (1 extremely alert - 5 neither alert nor sleepy - 9 very sleepy, great effort to keep awake, fighting sleep) (self-report questionnaire)
- Language versions
- 20+ langs; used internationally in sleep, fatigue, shift-work, aviation and driver-safety research (approx)
- Licence
- public-domain / open
Licence classification is a research judgement by the catalogue’s authors, not legal advice, and it can be out of date. Confirm terms with the copyright holder or publisher before using an instrument, especially for commercial use.
- Reference
- Akerstedt, T., & Gillberg, M. (1990). Subjective and objective sleepiness in the active individual. International Journal of Neuroscience, 52(1-2), 29-37.
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