Sleep disturbances are key symptoms of very early stage Alzheimer disease with behavioral and psychological symptoms: a Japan multi-center cross-sectional study (J-BIRD)

Kabeshita Y, Adachi H, Matsushita M, Kanemoto H, Sato S, Suzuki Y, Yoshiyama K, Shimomura T, Yoshida T, Shimizu H, Matsumoto T, Mori T, Kashibayashi T, Tanaka H, Hatada Y, Hashimoto M, Nishio Y, Komori K, Tanaka T, Yokoyama K, Tanimukai S, Ikeda M, Takeda M, Mori E, Kudo T, Kazui H. Sleep disturbances are key symptoms of very early stage Alzheimer disease with behavioral and psychological symptoms: a Japan multi-center cross-sectional study (J-BIRD). Int J Geriatr Psychiatry. 2017; 32(2): 222-230.