Self-reported sleep relates to hippocampal atrophy over the adult lifespan – results from the Lifebrain consortium by Fjell, AM, Sørensen, Ø, Amlien, IK, Bartrés-Faz, D, Bros, DM, Buchmann, N, Demuth, I, Drevon, CA, Düzel, S, Ebmeier, KP, Idland, A-V, Kietzmann, TC, Kievit, R, Kühn, S, Lindenberger, U, Mowinckel, AM, Nyberg, L, Price, D, Sexton, CE, Solé-Padullés, C, Pudas, S, Sederevicius, D, Suri, S, Wagner, G, Watne, LO, Westerhausen, R, Zsoldos, E, Walhovd, KB