@article{oai:air.repo.nii.ac.jp:00005400,
 author = {Nakagawa, Machiko and Ohta, Hidenobu and Shimabukuro, Rinshu and Asaka, Yoko and Nakazawa, Takayo and Oishi, Yoshihisa and Hirata, Michio and Ando, Akiko and Ikeda, Takashi and Yoshimura, Yuko and Mitani, Yusuke and Kaneshi, Yousuke and Morioka, Keita and Fukutomi, Rika and Kobayashi, Kyoko and Ozawa, Miwa and Takeshima, Masahiro and Mishima, Kazuo and Kikuchi, Mitsuru and Cho, Kazutoshi and Yoda, Hitoshi and Kusakawa, Isao},
 issue = {3028 (2021)},
 journal = {scientific reports},
 month = {Feb},
 note = {The purpose of the present study is to examine the association between toddlers' sleep arrangements and their nighttime sleep duration and other sleep variables. For this investigation, we performed a study in which child activity and sleep levels were recorded using actigraphy. The parents of 1.5-year-old toddlers (n = 106) were asked to attach an actigraphy unit to their child’s waist with an adjustable elastic belt and complete a sleep diary for 7 consecutive days. Questionnaires were used to assess the sleep arrangements of the toddlers. There was a significant negative correlation between nap duration and nighttime sleep duration, suggesting that longer nap sleep induces shorter nighttime sleep duration. Among the sleep arrangements, such as nighttime breastfeeding or co-sleeping, only nighttime breastfeeding predicted shorter nighttime sleep duration. Our findings indicate that shorter naps induce a longer nighttime sleep in 1.5-year-old toddlers while nighttime breastfeeding decreases their nighttime sleep duration.},
 title = {Daytime nap and nighttime breastfeeding are associated with toddlers' nighttime sleep},
 volume = {11},
 year = {2021}
}