Is short sleep bad for the brain? Brain structure and cognitive function in short sleepers by Fjell, AM, Sørensen, Ø, Wang, Y, Amlien, IK, Baaré, WFC, Bartrés-Faz, D, Boraxbekk, C-J, Brandmaier, AM, Demuth, I, Drevon, CA, Ebmeier, K, Ghisletta, P, Kievit, RA, Kühn, SA, Madsen, KS, Nyberg, L, Solé-Padullés, C, Vidal-Pineiro, D, Wagner, G, Watne, LO, Walhovd, KB