Stanford Sleepiness Scale SSS

The Stanford Sleepiness Scale (SSS) of Hoddes et al. (1973) is a scale on which momentary alertness can be assessed on a grading of 1 to 7 and thus serves to assess the circadian variations in daytime sleepiness. The scale describes gradual gradations of awareness; it varies between very alert and drowsy conditions. The alertness descriptions are also described, each with typical sensations (e.g. some slack, slows, woozy) characterized. Studies on the sensitivity of the scale showed that ratings in 15-minute intervals represent discrete changes in the degree of alertness. According to the response ratings point values are assigned for each time interval, which are then summated.

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