Именно на этот интригующий вопрос отвечают две публикации в журналах
1. Science Translational Medicine (J.J.Iliff, M.Wang, Y.Liao, B.A.Plogg, W.Peng, G.A.Gundersen, H.Benveniste, G.E.Vates, R.Deane, S.A.Goldman, E.A.Nagelhus, M.Nedergaard. A Paravascular Pathway Facilitates CSF Flow Through the Brain Parenchyma and the Clearance of Interstitial Solutes, Including Amyloid. Sci Transl Med 15 August 2012: Vol. 4, Issue 147, p. 147ra111 Sci. Transl. Med. DOI: 10.1126/scitranslmed.3003748)
и 2. Science (L.Xie, H.Kang, Q.Xu, M.J.Chen, Y.Liao, M.Thiyagarajan, J.O’Donnell, D.J.Christensen, Ch.Nicholson, J.J.Iliff, T.Takano, R.Deane, M.Nedergaard. Sleep Drives Metabolite Clearance from the Adult Brain. Science 18 October 2013: Vol. 342 no. 6156 pp. 373-377 DOI: 10.1126/science.1241224)