Research from Griffith University reveals that maintaining a bedroom temperature of 24°C can significantly reduce stress responses in older adults while they sleep. This study, led by Dr. Fergus O’Connor from the School of Allied Health, Sport and Social Work, highlights the physiological benefits of cooler sleeping conditions, particularly for individuals aged 65 years and over.
In the study, Dr. O’Connor assessed how increasing nighttime bedroom temperatures affects heart rate and stress responses. He noted, “When the human body is exposed to heat, its normal physiological response is to increase the heart rate.” This response occurs because the heart works harder to circulate blood to the skin surface for cooling. Prolonged exposure to higher temperatures can create stress on the heart, limiting recovery from previous heat exposure.
Participants in the study wore fitness activity trackers on their non-dominant wrists, while temperature sensors monitored the bedroom environment throughout the Australian summer. This setup provided real-world evidence of how rising bedroom temperatures impact both heart rates and stress levels.
Impact of Climate Change on Sleep and Health
Dr. O’Connor pointed out that climate change is contributing to an increase in the frequency of hot nights. He warned that this trend could independently lead to cardiovascular issues by impairing sleep and disrupting the body’s natural recovery processes. He stated, “While there are guidelines for maximum daytime indoor temperature, 26°C, there are no equivalent recommendations for nighttime conditions.”
The findings underscore the importance of creating a comfortable sleeping environment, particularly as climate conditions evolve. The paper, titled “Effect of nighttime bedroom temperature on heart rate variability in older adults: an observational study,” has been published in the journal BMC Medicine and funded by the Wellcome Trust.
With these insights, Dr. O’Connor encourages further discussions on setting appropriate temperature guidelines for sleeping conditions. As warmer nights become more prevalent, understanding their impact on health is crucial for improving overall well-being, especially among older populations.
