Fragmentation of Rapid Eye Movement and Nonrapid Eye Movement Sleep without Total Sleep Loss Impairs Hippocampus-Dependent Fear Memory Consolidation, de la Iglesia Horacio O, Kim Jeansok J, Katsuyama Ângela M, Lee Michael L, Duge Leanne S., Sriram Chaitra, and Krushelnytskyy Mykhaylo, Sleep, Jan-11-2016, Volume 39111193151410472191046521308981069210623416152312941715128114881052113459444722711111813121346, Issue 11, p.2021 - 2031 (2016)