Interaction of Long Working Hours and Sense of Coherence on Objective Total Sleep Time: Cross-Sectional Study From the SLEPT Study

Kei Muroi   ¹ , MD, PhD ;   Emi Morita   ^{1, 2} , PhD ;   Sumire Matsumoto   ¹ , PhD ;   Asuka Ishihara   ¹ , PhD ;   Sumi Hasegawa   ¹ , MSc ;   Mami Ishitsuka   ^{3, 4} , MSN ;   Daisuke Hori   ⁵ , MD, PhD ;   Shorato Doki   ⁵ , MD, PhD ;   Tsukasa Takahashi   ⁵ , MD, PhD ;   Shin-ichiro Sasahara   ⁵ , MD, PhD ;   Takashi Kanbayashi   ^{1, 6} , MD, PhD ;   Masashi Yanagisawa   ^{1, 7} , MD, PhD ;   Makoto Satoh   ¹ , MD, PhD ;   Ichiyo Matsuzaki   ^{1, 5} , MD, PhD

¹ International Institute for Integrative Sleep Medicine (WPI-IIIS), Tsukuba Institute for Advanced Research (TIAR), University of Tsukuba, Tsukuba, Japan

² Forestry and Forest Products Research Institute, Forest Research and Management Organization, Tsukuba, Japan

³ Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan

⁴ School of Nursing at Narita, International University of Health and Welfare, Narita, Japan

⁵ Institute of Medicine, University of Tsukuba, Tsukuba, Japan

⁶ Ibaraki Prefectural Medical Center of Psychiatry, Kasama, Ibaraki, Japan

⁷ Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, United States