The 21st International Conference “Man and Working Environment”
SAFETY ENGINEERING & MANAGEMENT SCIENCE, INDUSTRY, EDUCATION (SEMSIE 2025)   
PROCEEDINGS OF PAPERS 
25-26 September 2025, SOKOBANJA, SERBIA  

Milan Veljković , Snežana Živković 

ORIGINAL SCIENTIFIC PAPER

DIFFERENCES IN SLEEP QUALITY BETWEEN FIXED AND ROTATING SHIFTS 
AMONG MORNING AND EVENING TYPES  

DOI: 10.46793/SEMSIE25.105V
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Abstract:

This study examines sleep quality differences among 154 chemical industry workers (103 males, 51 females) categorized by chronotype (morning/evening) using the Morningness–Eveningness Questionnaire (MEQ). Participants worked either fixed or rotating shifts. The results show significant differences in sleep quality based on shift type and chronotype. Morning chronotypes in fixed morning shifts reported better sleep quality, while evening chronotypes surprisingly benefited from fixed morning shifts, experiencing the best sleep quality compared to those in rotating shifts. The findings highlight the importance of considering both chronotype and shift type when evaluating sleep quality. Circadian rhythm plays a crucial role in regulating sleep patterns, and shift work can disrupt this rhythm, leading to poorer sleep quality. The stability and predictability of fixed shifts provide advantages, even for evening chronotypes, by allowing them to establish routines and improve sleep quality.

Keywords:

Chronotypes, shift work, sleep quality, circadian rhythm 

ACKNOWLEDGEMENTS:

This paper is the result of research funded by the Ministry of Education, Science and Technological Development of the Republic of Serbia.

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