Discrimination between extreme chronotypes using the full and reduced version of the Morningness-Eveningness Questionnaire

13.70% overlap in ideal midpoint of sleep was observed among evening-types using the reduced Morningness-Eveningness Questionnaire (rMEQ).

• The reduced MEQ showed a significantly lower overlap in ideal midpoint of sleep (13.70%) compared to the full MEQ (46.28%).
• For ideal get-up time, the overlap was also lower in the rMEQ (47.04%) than in the MEQ (62.34%).
• In an objective analysis with actigraphic data, no significant differences in overlap were found between MEQ and rMEQ.
• The findings suggest that the rMEQ may better differentiate between morning- and evening-types based on subjective assessments.
• The lack of significant results in the objective approach may indicate a masking effect due to social rhythms.

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