Seasonal changes in sleep duration and sleep problems: A prospective study in Japanese community residents Suzuki, Masahiro ; Taniguchi, Tetsuya ; Furihata, Ryuji ; Yoshita, Katsushi ; Arai, Yusuke ; Yoshiike, Nobuo ; Uchiyama, Makoto Abstract Publication: PLoS ONE Pub Date: April 2019 DOI: 10.1371/journal.pone.0215345 Bibcode: 2019PLoSO..1415345S