[O2–07–04]: AGE‐RELATED NREM‐SLEEP FRAGMENTATION: RELATIONSHIPS WITH STRUCTURAL AND METABOLIC BRAIN ALTERATIONS, AMYLOID BURDEN AND COGNITIVE PERFORMANCE. (1st July 2017) - André, Claire; Tomadesso, Clémence; Mézenge, Florence; Branger, Pierre; de Flores, Robin; Eustache, Francis; Chetelat, Gael; Rauchs, Géraldine