Lifelines participants (or their parents, in case of underage participants) were asked whether they suffered from insomnia (section: Diseases & symptoms).
In the context of an additional assessment, ADHQ, the Minimal Insomnia Symptom Scale (MISS) was used¹⁾ Other sleeping habits of participants were assessed with several general questions as well as the Munich ChronoType Quesitonnaire, the Pittsburgh Sleep Quality Index and the Epworth Sleepiness Scale.