Background and rationale {6a}
sleepiness
Too little sleep and the consequences thereof are a heavy burden in modern societies. Estimating that people sleep on average up to 2 h less over the last decades, sleepiness needs to be considered as a significant societal problem of our modern world [In contrast to alcohol or illicit drug use, there are no quick roadside or workplace tests for objective biomarkers for sleepiness. High inter-individual variability and subjective misinterpretations of sleepiness and sleep propensity provide a challenge to the development of objective sleepiness markers [