The invention of the electric light bulb marked the beginning of modern sleep disorders, but it did not actually reduce the total amount of time people spend asleep, according to a report by EL PAÍS published on Tuesday, August 25, 2026.
EL PAÍS reports that the introduction of artificial lighting fundamentally altered when and how people sleep, ushering in a new era of sleep-related problems. However, the outlet notes that despite these changes in sleep patterns, the overall duration of sleep has remained consistent.
The report suggests that the light bulb did not make people sleep less, but rather changed the structure and timing of sleep. This distinction is key, as it implies that sleep disorders linked to electric lighting are more about disruption and irregularity than about a simple reduction in hours slept.
According to EL PAÍS, the shift in sleep habits began with the widespread adoption of the light bulb, which allowed people to stay active well after sunset. This extended wakefulness altered natural circadian rhythms, which are the internal processes that regulate the sleep-wake cycle.
The article from EL PAÍS indicates that while the light bulb changed the quality and consistency of sleep, it did not lead to a measurable decrease in total sleep time. This finding challenges the common assumption that modern technology has made us sleep less than our ancestors.
Looking ahead, researchers and health experts are likely to continue examining how artificial light affects sleep quality and whether modern lighting solutions, such as LED bulbs and screens, have a different impact on sleep patterns than the original incandescent bulbs.
