Should You Keep Wi-Fi On at Night?

Concerns about keeping Wi-Fi on at night have grown, with some people worried about possible health effects from continuous exposure. Health organizations like the WHO state that the low-level radiofrequency (RF) radiation from Wi-Fi routers is safe, and most scientific studies have found no conclusive evidence linking 24/7 Wi-Fi exposure to negative effects on sleep or brain function. Controlled trials also show no significant impact on sleep quality in healthy adults.

However, a few recent studies and anecdotal reports suggest that certain individuals may be more sensitive. A 2024 study found that participants exposed to Wi-Fi and baby monitor radiation for a week experienced increased brain activity during non-REM sleep and higher rates of insomnia. Some experts recommend placing routers away from bedrooms, especially for those with sleep disturbances. Additionally, some individuals report symptoms linked to electromagnetic hypersensitivity (EHS), though it's not officially recognized as a medical condition.

Animal studies on prolonged RF exposure have produced mixed results, with some indicating potential links to cellular stress and reduced fertility. But these experiments typically involve radiation levels far beyond those from typical household routers, making it difficult to apply the findings to everyday human exposure. Researchers continue to explore theoretical risks like effects on mitochondrial function and circadian rhythms, but human trials have not confirmed these concerns.

For most people, there is no strong evidence that leaving Wi-Fi on at night is harmful. Still, those who are concerned or feel affected can choose to switch off their routers overnight or move them away from sleeping areas. This can also slightly reduce energy use and improve network security. Ultimately, while health risks from household Wi-Fi remain minimal by international standards, more research is needed to understand individual variability in EMF sensitivity.