2.5.3. Munich ChronoType questionnaire

The Munich ChronoType questionnaire (MCTQ) is a self-rated scale to assess primary sleep times, such as bed- and rise-times, plus the clock time of becoming fully awake as well as sleep latency and inertia. It consists of 17 items addressing questions about bedtime (BT), time preparing to sleep (TSP), sleep latency (SL), sleep end (SE), time to stand up (SI), light exposure (LE) and alarm clock separated for free (f) and work (w) days. In this study, we used data only from free days, as we know that there are great differences between SP on work and free days (24). Based on these facts, values like sleep onset (SO=TSP+SL), time to get up (GU= SE + SI), sleep duration (SD=SE-SO) and total bedtime (TBT=GU-BT) are computed. The estimation of chronotype is based on the midpoint between SO and SE on free days without the use of an alarm clock (MS=(SE-SO)/2) (8, 24, 25). Its original form is in German and the questionnaire has been validated (8).