Studies

A South Korean study confirmed the positive effects of natural daylight on the length of patient hospitalization.

About study

✓ Overall health

Title:

The Effects of Natural Daylight on Length of Hospital Stay

Author: Man Young Park, Choul-Gyun Chai, Hae-Kyung Lee, Hani Moon, Jai Sung Noh Korea Institute of Oriental Medicine, Architectural Environment Research Institute, Kwangwoon University, Seoul, Korea, Ajou University, Suwon, Korea
Date: 14. September 2025
Source: https://doi.org/10.1177/1178630218812817

Brief summary

In a fifteen-year retrospective study from South Korea, the medical records of more than 85,000 patients were analyzed, and researchers demonstrated that natural daylight significantly affects the length of hospitalization. Patients lying by the window were hospitalized for a shorter period than those lying by the door with limited access to natural light. The difference in length of stay averaged 0.43 days in favor of the patients by the windows. This association remained significant even after adjusting for confounding variables such as age, sex, and department using multiple regression analysis. The results show that access to natural light accelerates recovery and improves the efficiency of healthcare, which is of fundamental importance both for patients and for healthcare facilities.

Daylight shortens patient hospitalization by stabilizing their circadian rhythms and related biological processes

The results of the study clearly show that patients hospitalized near windows had an average stay shorter by 0.43 days compared to those near doors, with the difference remaining statistically significant even after controlling for all major confounding variables (age, sex, department). Natural daylight thus demonstrably accelerates patient recovery by influencing circadian rhythms, sleep quality, and patients’ mental state. Daylight stabilizes sleep cycles, reduces stress, and supports the immune system, which ultimately results in a faster and more effective course of treatment.

Shorter hospitalization means not only a quicker return of patients to everyday life but also higher hospital productivity

Access to natural daylight shortens the length of hospitalization, which according to the study’s authors may also have direct economic impacts such as restoring hospital capacity, reducing waiting times, and increasing the efficiency of bed use. This leads not only to higher productivity of the healthcare system but also to financial savings and better planning of hospital infrastructure.

Natural daylight, or its substitute in the form of full-spectrum lighting that mimics sunlight, helps patients reduce stress, improve sleep, and enhance the body’s overall physical capacity. Other studies show that sufficient light may act preventively against infections, lower heart and pulse rates, improve oxygen intake, and contribute to psychological stability. Conversely, its lack is often associated with fatigue, insomnia, increased risk of diseases, or psychiatric issues. Therefore, emphasis on lighting conditions when designing healthcare facilities is essential.

Translated using AI

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