A wave of social media posts has sparked curiosity around a simple bedtime habit: switching off your Wi-Fi router at night. Some claim it boosts sleep quality, reduces headaches, and even improves mental clarity. But is there any science to back this? Here's what experts say happens when you turn off your Wi-Fi for seven nights in a row.Does Wi-Fi Radiation Affect Your Body?Wi-Fi routers emit non-ionising radiation — a low-level form of electromagnetic radiation (EMF) — that is widely considered safe under normal household exposure. Dr Hiran S. Reddy, consultant physician, diabetologist, and critical care specialist at Gleneagles Hospital, Hyderabad, who spoke to Indian Express said that for most people, turning off the router is unlikely to cause any physiological changes.“WiFi devices emit low-level, non-ionising radiation, which current scientific consensus deems safe at everyday exposure levels,” he explained.However, Dr Reddy noted that people who report heightened sensitivity to electromagnetic fields — a condition known as electromagnetic hypersensitivity — may experience perceived relief from symptoms like headaches, fatigue, and sleep disturbances. But clinical evidence for this condition remains inconclusive.Is Sleep Impacted by Wi-Fi Signals?Dr Sudhir Kumar, consultant neurologist at Apollo Hospitals, Hyderabad, speaking to Indian Express told that most studies on Wi-Fi radiation have been conducted on animals. “There’s no conclusive evidence that Wi-Fi disrupts melatonin production from the pineal gland or interferes with human sleep,” he says.He explains that Wi-Fi routers typically operate at 2.4 GHz or 5 GHz frequencies, which emit far less energy than a mobile phone held close to the head. At common indoor distances (1–2 metres), the signal strength drops significantly, making it unlikely to influence melatonin or sleep in any measurable way.The Real Sleep Disruptor: Screen TimeInterestingly, both doctors agree that if anything is affecting sleep, it’s likely the screen time, not the router itself. Blue light emitted from phones, tablets, and laptops interferes with the pineal gland and suppresses melatonin — the hormone that regulates the sleep-wake cycle.“Disabling Wi-Fi might reduce digital engagement, particularly screen exposure late at night. That can indirectly improve melatonin production and sleep quality,” says Dr Reddy.Better Sleep Hygiene, Not Less RadiationWhile switching off your Wi-Fi router for seven nights won’t likely cause direct changes in your brain or body, it may lead to better bedtime routines. Less internet access could mean fewer late-night scrolls, reduced digital distractions, and an earlier wind-down — all of which support better sleep hygiene.“Quality sleep enhances everything from mood and cognitive function to immune health,” Dr Reddy noted.What Does The Study Say?As per the 2020 study published in the International Journal of Hygiene and Environmental Health, titled: Spending the night next to a router – Results from the first human experimental study investigating the impact of Wi-Fi exposure on sleep, a night of Wi-Fi exposure doesn’t seem to cause sleep problems for healthy young men — but it might make very subtle changes in brain activity that scientists are still trying to understand.How Was The Study Conducted?Researchers studied how Wi-Fi exposure might affect sleep. They invited 34 healthy young men (average age around 24) to stay in a sleep lab for five nights. The first night helped them get used to the lab. Then, they had two test nights — each one following a “normal” night to compare results.During the test nights, some participants were exposed to Wi-Fi signals (at 2.45 GHz, like your home router), while others got fake (sham) signals. The researchers didn’t tell the participants which one they were getting. Sleep was measured in two ways:Subjective sleep: How well participants felt they slept (through a questionnaire).Objective sleep: What actually happened in their brains and bodies during sleep (measured using special equipment called polysomnography).What They FoundThe Wi-Fi signals did not cause any major or noticeable effects on:How well participants thought they sleptThe general structure and stages of their sleep (called sleep macrostructure)However, a detailed look at brain activity showed a small change:There was a slight decrease in brain wave activity in the alpha frequency range (8–11.75 Hz) during deep (non-REM) sleep when Wi-Fi was on. This change is called a reduction in EEG alpha power.What It MeansWi-Fi signals didn’t seem to change how people felt they slept or the main parts of their sleep.There was a small, measurable brain activity change, but it’s unclear if this has any real impact on health or sleep quality.