PENGARUH POLA TIDUR SPLIT SLEEP TERHADAP KELELAHAN BERDASARKAN INDIKATOR OKULAR DAN EKSPRESI WAJAH SAAT MENGEMUDIKAN SIMULATOR KERETA API

• Main Author: Ramadhania, Neira
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/76168
• Institution: Institut Teknologi Bandung

Fatigue is an important safety issue in the railway sector. In driving activities, some factor that is closely related to fatigue is sleep condition. However, in order to fulfill their sleep needs, machinists tend to apply split sleep that may lead to poor sleep quality. This study aims to evaluate the effect of split sleep on fatigue level while driving a train simulator. Fifteen male participants with similar characteristics to machinists were asked to drive a train simulator for 2.5 hours in the laboratory after applying three sleep conditions, split sleep, consolidated sleep, and baseline. In the split sleep condition, sleep was divided into two segments at 05.00 - 10.00 and 12.00 - 15.00. Consolidated sleep is performed continuously at 05.00 - 13.00. Meanwhile, the baseline condition performed continuous sleep at 21.00 - 05.00. Fatigue was measured using ocular indicators (blink duration, blink frequency, fixation duration, and microsleep/minute), facial expressions (Behaviour- Observed Rating Scale and video rating), and subjective (Karolinska Sleepiness Scale and Visual Analogue Scale questionnaires). Measurements of ocular indicators and facial expressions were taken continuously for 2.5 hours, while subjective questionnaires were completed every 10-minute interval. The results of this study showed an increase in fatigue and significant differences in the three sleep states based on ocular indicators and facial expressions. However, the subjective indicator data did not show any difference between the three sleep conditions, showing only a difference in driving duration. From this study, it can be concluded that the split sleep condition has a higher fatigue level of 7% - 53% compared to normal sleep based on the measurement of ocular indicators and facial expressions. Therefore, split sleep is not recommended for drivers as it can increase fatigue. However, if split sleep must be applied, it is necessary to implement a fatigue risk management system to overcome the problem. In addition, fatigue and sleep management training can be conducted as education related to good sleep and fatigue management. For future research, field validation can be conducted to ensure the simulator is good and has high fidelity.