The Human Brain Generates Enough Electricity to Power a Small LED
Even at rest, the brain produces between 10 and 23 watts of electrical power through billions of firing neurons. That is roughly enough energy to keep a low-wattage night-light glowing. Brain waves can be measured non-invasively with EEG sensors.
💡 Fun detail:
If all neurons fired simultaneously, the theoretical power output could briefly illuminate the bulb, but the brain carefully staggers signals to avoid overload.
Source: National Institutes of Health