Ep 215 - The Cannibal Brain Myth (What Sleep Deprivation Actually Does to Your Neurology)

Have you seen the viral meme claiming that a lack of sleep causes your brain to "eat itself"? On this #StudyFinds episode of #ProveItPod, Dr. Matt Law tracks down the actual science behind the sensationalism. We look at the original mouse study that sparked the panic, map it onto three massive human studies, and explain the mechanical reality of your brain's glymphatic system. Spoiler alert: your brain isn't eating itself, but your biological janitorial crew is aggressively dismantling your neural hardware. We break down the implications of acute sleep loss, the 25-year risk of dementia, and how untreated sleep apnea is the ultimate silent hazard for the modern workforce.

References:

Bellesi, M., de Vivo, L., Chini, M., Gilli, F., Tononi, G., & Cirelli, C. (2017). Sellp loss promotes astrocytic phagocytosis and microglial activation in mouse cerebral cortex. Journal of Neuroscience, 37(21), 5263-5273. https://doi.org/10.1523/JNEUROSCI.3981-16.2017

Benedict, C., Blennow, K., Zetterberg, H., & Cedernaes, J. (2020). Effects of acute sleep loss on diurnal plasma dynamics of CNS health biomarkers in young men. Neurology, 94(11), e1181-e1189. https://doi.org/10.1212/WNL.0000000000008866

Eugene, A. R., & Masiak, J. (2015). The neuroprotective aspects of sleep. MEDtube Science, 3(1), 35–40. https://pmc.ncbi.nlm.nih.gov/articles/PMC4651462/

Hopp, M. (n.d.) Sleep deprivation & brain health: Is your brain really eating itself? Daybreak. https://www.thedaybreak.com/resources/sleep-deprivation-and-brain-health-is-your-brain-really-eating-itself

Sabia, S., Fayosse, A., Dumurgier, J., van Hees, V. T., Paquet, C., Sommerlad, A., Kivimäki, M., Dugravot, A., & Singh-Manoux, A. (2021) Association of sleep duration in middle and old age with incidence of dementia. Nature Communications, 12(1):2289. https://doi.org/10.1038/s41467-021-22354-2