Was Cajal right about sleep?

Cajal's careful observations of the anatomy of the nervous system led him to some lesser-known predictions about the function of glia as mediators of sleep. Reporting over 120 years later in BMC Biology, Bellesi et al. examine changes in gene expression and morphology of astrocytes with sleep. Their results provide support for and revisions to Cajal's predictions. See research article: doi: 10.1186/s12915-015-0176-7.