Researchers at the Yong Loo Lin School of Medicine, National University of Singapore, have discovered that sleep deprivation affects a key brain circuit involved in social memory, and that caffeine may help repair this damage. The study, published in Neuropsychopharmacology, highlights how caffeine can counteract the impairments caused by lack of sleep in this specific neural pathway.
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Social memory, which enables individuals to recognize familiar faces, relies heavily on the hippocampal CA2 region of the brain. The research team, led by Associate Professor Sreedharan Sajikumar and first author Dr. Lik-Wei Wong, found that sleep loss impairs synaptic plasticity in this area, weakening communication between neurons and consequently affecting social recognition.
In their experiments, the researchers induced five hours of sleep deprivation followed by a week of caffeine administration through drinking water. Caffeine acts as a stimulant by blocking adenosine receptors, which accumulate during wakefulness and reduce brain activity.
The findings showed that sleep deprivation significantly disrupted synaptic plasticity in the CA2 region, leading to deficits in social memory. When caffeine was administered prior to sleep deprivation, synaptic communication was restored, and memory performance improved.
Importantly, the study noted that caffeine did not lead to overstimulation in the brain, indicating that its effects were specific to the impaired pathways. Dr. Wong remarked that sleep deprivation selectively disrupts crucial memory circuits, and caffeine can reverse these effects significantly at both molecular and behavioral levels.
Associate Professor Sajikumar highlighted the importance of the CA2 region as a vital hub linking sleep and social memory, emphasizing that the research could lead to better understanding of sleep-related cognitive decline and inform future treatments for cognitive disorders.
The research team plans to further investigate how caffeine influences memory consolidation and retrieval, utilizing targeted techniques to clarify the relationships within these neural pathways. The study was published on February 10, 2026.