Brain rot in the digital age: Sleep loss, circadian disruption, and neurocognitive vulnerability

Jun 10, 2026Chronobiology international

Sleep Loss and Body Clock Disruption Linked to Brain Health and Thinking Problems in the Digital Age

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Circadian Biology on OpenScience ↗PubMed ↗DOI ↗

Abstract

Evidence indicates a connection between evening digital media use and next-day attentional and emotional dysregulation.

Prolonged engagement with high-intensity digital media may lead to attentional fragmentation and cognitive fatigue.
Evening or post-bedtime digital exposure is associated with sleep displacement and melatonin suppression.
Circadian delay and shortened sleep may result from frequent digital media use.
Downstream mechanisms under consideration include changes in synaptic balance and brain network stability.
Indirect evidence suggests a link between digital media-related sleep restriction and neurodegeneration, but this remains unproven.

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The colloquial expression "brain rot" is increasingly used to describe attentional fragmentation, cognitive fatigue, motivational blunting, and a sense of mental "slowness" after prolonged engagement with high-intensity digital media. In this semi-structured narrative review, we use the term as a heuristic bridge concept rather than a formal diagnosis and examine whether sleep and circadian mechanisms provide a biologically coherent account of these complaints. PubMed and Google Scholar were searched through March 2026, with emphasis on chronobiology, sleep deprivation/restriction, digital media use, reward-heavy platforms, media multitasking, and adolescent development. The strongest direct human evidence supports a proximal pathway from evening or post-bedtime digital exposure to sleep displacement, melatonin suppression, circadian delay, shortened sleep, and next-day attentional and emotional dysregulation. We then review candidate downstream mechanisms involving synaptic homeostasis, cortical excitation-inhibition balance, thalamocortical oscillations, large-scale network instability, and reward-related behavior. By contrast, evidence linking typical digital-media-associated partial sleep restriction to amyloid or tau accumulation remains indirect and should not be interpreted as proof of neurodegeneration. Overall, "brain rot" is best conceptualized as a sleep- and circadian-linked neurocognitive vulnerability state, with particularly high relevance to adolescents and young adults because of developmental phase-delay biology, ongoing maturation of prefrontal executive control, and environmental timing pressures.