Italian Multicentric Group on clock genes and actigraphy in AD: Federico Cucchiaraa,b, Alessandro Schirruc, Lo Gerfo Annalisac, Lombardi Gemmad, Arnaldi Darioe,f, Pietro Mattioli e,f, Flavio Nobilie,f, Gianluigi Cerronig.h Antonella Bartolig,h, Raffaele Mannii, Elena Sinforianij, Michele Terzaghii,k, Maria Grazia Arenal, Rosalia Silvestrim, Maria Caterina Di Perrim, Ferdinando Franzonic, Gloria Tognonic, Michelangelo Mancusoc, Sandro Sorbin , Ubaldo Bonuccellic, Ugo Faragunaa,o. The gene discussed is CLOCK; the disease is Alzheimer disease.