Impact of Sleep Deprivation on Sleepiness, Fatigue, and Psychomotor Vigilance Among Anesthesiology and Intensive Care Residents in Tunisia: A Multicenter Cross-Sectional Study
This multicenter cross-sectional study of Tunisian anesthesiology and intensive care residents reveals that excessive daytime sleepiness and fatigue following overnight on-call duty are highly prevalent and significantly associated with impaired psychomotor vigilance, highlighting a critical risk to patient safety.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Sleep is not merely a pause in our day; it is a biological necessity that keeps the mind sharp and the body steady. When adults do not get enough rest, their ability to think clearly, remember details, and react quickly begins to fade. This is especially true for people who must make life-or-death decisions while exhausted, such as doctors working long shifts in hospitals. For decades, researchers have known that missing sleep leads to daytime drowsiness and a feeling of heavy tiredness, but measuring exactly how this affects a doctor's hands and mind in real time has been difficult. The question remains: just how much does a single night of poor sleep degrade the performance of a specialist who must remain alert for their patients?
In Tunisia, a team of researchers set out to answer this question by looking directly at the residents training to become anesthesiologists and intensive care specialists. These are the doctors who manage pain and keep patients alive during surgery and critical illness, roles that demand constant, high-level attention. The study took place across four teaching hospitals over the course of one month in 2025. The researchers invited every eligible resident to participate, resulting in a complete group of fifty-six doctors who had just finished a scheduled twelve-hour overnight shift. Immediately after their shift ended, these doctors filled out questionnaires about how sleepy and tired they felt, and then they performed a simple computer test designed to measure their reaction speed. This test, known as a psychomotor vigilance test, asks the user to tap a screen the moment a red light appears. It is a straightforward task, but it reveals how quickly the brain processes visual information and how steady the hand remains under pressure.
The results painted a clear and concerning picture. The vast majority of the residents, more than eight out of ten, reported feeling excessively sleepy during the day, a level of drowsiness that goes beyond normal tiredness. More than half of the group also reported feeling a level of fatigue that interfered with their daily functioning. When these doctors took the reaction time test, their average speed was significantly slower than what is considered normal for a rested person. The researchers found that the doctors who reported the highest levels of sleepiness were the ones who performed the worst on the test. They took longer to react to the red lights, made more mistakes by missing the lights entirely, and also made more errors by tapping the screen too early, before the light even appeared. Their reaction times were not just slow; they were inconsistent, swinging between very fast and very slow responses, which indicates an unstable level of attention.
The link between feeling tired and performing poorly was just as strong for fatigue. The residents who scored highest on the fatigue scale showed the most significant decline in their test performance. They had the longest reaction times, the most errors, and the greatest variation in how quickly they responded. This suggests that the feeling of exhaustion is not just a subjective complaint but a measurable state that directly slows down the brain's processing speed. The study did not find that every single doctor performed poorly, but the pattern was undeniable: those who felt the most sleep-deprived were the ones whose hands and minds were the slowest to respond.
This research highlights a critical gap between the demands placed on medical trainees and their physical capacity to meet them. The study confirms that the overnight shifts common in these specialties leave residents with a heavy burden of sleepiness and fatigue that directly impairs their ability to stay alert. While the study was limited to a specific group of doctors in Tunisia and relied on self-reported feelings of tiredness, the connection between those feelings and the drop in reaction speed was statistically clear. The findings suggest that the current schedule of overnight duties may be compromising the very vigilance these doctors need to keep their patients safe. The authors conclude that changing how these shifts are organized, perhaps by allowing for better rest periods, could help protect both the health of the doctors and the safety of the people they treat.
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