Extreme heat may raise suicide risk by disrupting sleep and emotional regulation, study finds

by Georgetown University Medical Center

edited by Gaby Clark, reviewed by Andrew Zinin

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In a study conducted by the World Bank and Georgetown University, scientists, including lead author Syed Shabab Wahid, DrPH, are investigating how climate change–induced heat exposure is an emerging public health concern with potential mental health consequences.

The finding, published Oct. 24, 2026, in Environmental Research, identifies how poor sleep quality and emotional dysregulation mediate the relationship between exposure to extreme heat and suicide risk.

We asked Wahid, an assistant professor in the Department of Global Health at Georgetown's School of Health, who also leads Georgetown's Global Mental Health & Well-Being Initiative, to share more about his research and its potential implications.

The challenge

"Rising global temperatures threaten human mental health on a massive scale. Extreme heat events are becoming more frequent, longer, and more intense due to climate change. In climate-vulnerable nations such as Bangladesh, this heat stress can translate into severe psychological strain and elevated suicide risk. Understanding how environmental shifts degrade human well-being could help protect vulnerable populations, safeguard mental health, and guide climate adaptation strategies worldwide."

The barriers

"Earlier public health efforts recognized broad statistical correlations between elevated temperatures and self-harm, yet two problems remained underaddressed. First, limited evidence on specific temperature thresholds at which suicide risk is first manifested and then ultimately reaches maximum levels makes it difficult to formulate public health prevention strategies; this is especially true in Bangladesh.

"Second, the underlying biological and psychological pathways that connect heat exposure and adverse mental health remain unclear. Without identifying how ambient heat disrupts daily physiological functions and emotional control, policymakers, public health professionals and clinicians were limited in developing targeted interventions. This critical knowledge gap has left communities without specific public health warnings or protective mental health support during extreme heat events."

The discovery

"Our nationally representative panel study shows that extreme heat is significantly associated with suicide risk, first manifesting at 28 degrees Celsius [82 degrees Fahrenheit] and maximizing at 35 degrees Celsius [95 degrees Fahrenheit] through two interconnected mediators: disrupted sleep and emotional dysregulation. At the 35°C (95 degrees Fahrenheit) temperature threshold, we find 29.5% of the total association between heat and suicide risk to be mediated through poor sleep quality and 1.8% through emotional dysregulation.

"These findings indicate that high ambient temperatures can impair restorative sleep patterns. Heat can also weaken an individual's ability to regulate difficult emotions and manage acute psychological distress. By providing preliminary evidence on this potential chain of impact, our findings demonstrate that heat has an important role in essential psychological and behavioral functions that increase suicide risk and endanger mental health and well-being."

The path toward solutions

"This study provides a concrete framework for early intervention. Rather than treating climate-related mental health crises as unpreventable events, public health systems can now focus on intermediate, modifiable targets. Health agencies can monitor heat waves alongside sleep quality disruption indicators to mobilize preventive interventions. Interventions centered on sleep preservation, household cooling access, and community-based emotional regulation training should serve as effective suicide prevention tools during heat waves."

The possibilities

"This line of research can integrate mental health care into national climate resilience planning and early warning systems. Future work can evaluate low-cost cooling technologies, passive home architecture, and behavioral interventions that shield vulnerable communities from thermal stress during the night. Expanding longitudinal research across other low-resource regions will help design scalable safeguards that protect human lives in a warming world."

Another way to see it…

"Imagine a smartphone with a drained battery, overheating processor, and critical apps crashing all at once. Sustained ambient heat acts on the human brain and body in the same way. The body cannot cool down at night, leading to broken rest and depleting mental reserves. When the emotional processor overheats without restorative recovery, coping mechanisms collapse under stress."

Publication details

Syed Shabab Wahid et al., Climate-induced extreme heat associated with suicide risk mediated by poor sleep and emotional dysregulation: A nationally representative panel study from Bangladesh, Environmental Research (2026). DOI: 10.1016/j.envres.2026.125991

Journal information: Environmental Research

Key medical concepts

Suicide riskPoor sleepAbnormal emotional state

Clinical categories

PsychiatryPsychology & Mental healthSleep medicineSleep & RecoveryCommon illnesses & Prevention Provided by Georgetown University Medical Center Who's behind this story?

Gaby Clark

MA in English, copy editor since 2021 with experience in higher education and health content. Dedicated to trustworthy science news. Full profile →

Andrew Zinin

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