Daytime Sleepiness

Please note that this product can only be administrated if you have an online VTS Subscription or a local VTS version from 8.2.10 or higher.

This product requires an additional device. For more information please contact us.

Field of Application+

Detailed Description+

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.

English (USA)


Test administration+

Controlled Mode


The SLEEP test set comprises the following dimensions and tests:
DimensionsTestsTest formsDuration in min.
Durationapprox. 40
Sleepiness / Alertness
Tonic central nervous system activation Phasic central nervous system activationRTS7approx. 8
VigilanceWAFS1 (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:
DimensionsTestsTest formsDuration in min.
Total length if all dimensions and a break are presentedapprox. 91
Divided attentionWAFS1 (unimodal visual)approx. 8
Selective attentionWAFS1 (unimodal visual)approx. 6
Sustained attentionWAFS1 (visual)approx. 32

  • 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.
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Products specifications
LanguagesEnglish (USA), German
Test informationbased on statutory requirements <i class="fas fa-info-circle tooltips test-info" data-container="body" data-placement="top" data-toggle="tooltip" title="The contents of the test set - in other words, the ability and personality dimensions that are assessed - are based on statutory regulations and requirements."></i>, additional device required <i class="fas fa-info-circle tooltips test-info" data-container="body" data-placement="top" data-toggle="tooltip" title="A SCHUHFRIED peripheral device (e.g. a Response Panel) is needed for proper administration of the test."></i>, test(s) specifically adapted for test set <i class="fas fa-info-circle tooltips test-info" data-container="body" data-placement="top" data-toggle="tooltip" title="At least one test has been adapted for administration in the test set. For example, a specifically adapted test may have been shortened to reduce the overall testing time. The psychometric properties of all adaptations have been investigated and confirmed."></i>