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SLEEP Daytime Sleepiness



The SLEEP Daytime Sleepiness test set measures performance impairments as a result of daytime sleepiness in a traffic psychology and traffic medicine context.
Daytime sleepiness and the resulting impairments in the workplace, in social situations or with regard to fitness to drive are a key symptom of many sleep disorders and illnesses (Weeß, 2004). Daytime sleepiness involves reduced alertness or reduced central nervous system arousal. Typical signs of increased daytime sleepiness include attentional disorders, falling asleep unintentionally and microsleep. The risk of falling asleep unintentionally is greatest in monotonous, low-stimulus situations, such as frequently occur when driving. The act of falling asleep can occur spontaneously and unexpectedly; it cannot be voluntarily suppressed. In traffic psychological and clinical neuropsychological reporting, therefore, professional drivers are often the focus of the investigation. However, increased daytime sleepiness also often occurs as a symptom of various physical and mental disorders. In the test set scoring all the trait areas are summarized in accordance with the Guidelines on Assessment of Fitness to Drive, providing the user with a concise overview of possible impairments of performance if the respondent is affected by daytime sleepiness.

Legal basis and validation

The most recent edition of the German Guidelines on Assessment of Fitness to Drive of 1 May 2014 (BGL, published by the Bundesanstalt für Straßenwesen; Gräcmann & Albrecht, 2014) includes a new section on daytime sleepiness that points out the importance of this factor in assessing mental capacity in the context of fitness to drive. Development of the SLEEP test set is based on the requirements of the BGL with regard to fitness to drive. Daytime sleepiness has also been identified in various studies as a key source of risk and one that increases the likelihood of fatal traffic accidents (see studies of the Bundesanstalt für Straßenwesen, the Austrian Kuratorium für Verkehrssicherheit (KFV) and the HUK Verband).


  • Table of raw scores, percentile ranks and confidence intervals and rating of relevant dimensions using a simple color scheme (traffic-light system: red-yellow-green).
  • Profile
  • Written report with profile and verbal description of the individual results. Here, too, the traffic light color scheme makes it easy to take in the results at a glance.


The SLEEP test set comprises the following dimensions and tests:
Dimensions Tests Testform/Subtests Duration in minutes
Duration approx. 40
Sleepiness / Alertness
Tonic central nervous system activation Phasic central nervous system activation RT S7 approx. 8
Vigilance WAF S1 (visual) approx. 32
For more detailed investigation of the dimensions of attention in accordance with Stage 2 of the reporting guidelines, the following tests can be optionally administered after a five-minute break:
Dimensions Tests Testform/Subtests Duration in minutes
Total length if all dimensions and a break are presented approx. 91
Divided attention WAF S1 (unimodal visual) approx. 8
Selective attention WAF S1 (unimodal visual) approx. 6
Sustained attention WAF S1 (visual) approx. 32

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Test information

cross-test scoring
cross-test norming
cross-test validation
based on statutory requirements
test(s) specifically adapted for test set
additional device required
supervisor-supported testing