ヤマガタ　トモコ   Yamagata Tomoko   山形　朋子    所属   東邦大学  医学部 医学科    職種   助教
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Waking experience modulates sleep need in mice
掲載誌名	正式名：BMC Biology 略　 称：BMC BIOL ISSNコード：17417007
掲載区分	国外
出版社	BMC
巻・号・頁	19(65)
国際共著	国際共著
著者・共著者	Linus Milinski, Simon P. Fisher, Nanyi Cui, Laura E. McKillop, Cristina Blanco-Duque, Gauri Ang, Tomoko Yamagata, David M. Bannerman & Vladyslav V. Vyazovskiy
発行年月	2021/04/06
概要	Background Homeostatic regulation of sleep is reflected in the maintenance of a daily balance between sleep and wakefulness. Although numerous internal and external factors can influence sleep, it is unclear whether and to what extent the process that keeps track of time spent awake is determined by the content of the waking experience. We hypothesised that alterations in environmental conditions may elicit different types of wakefulness, which will in turn influence both the capacity to sustain continuous wakefulness as well as the rates of accumulating sleep pressure. To address this, we compared the effects of repetitive behaviours such as voluntary wheel running or performing a simple touchscreen task, with wakefulness dominated by novel object exploration, on sleep timing and EEG slow-wave activity (SWA) during subsequent NREM sleep. Results We find that voluntary wheel running is associated with higher wake EEG theta-frequency activity and results in longer wake episodes, as compared with exploratory behaviour; yet, it does not lead to higher levels of EEG SWA during subsequent NREM sleep in either the frontal or occipital derivation. Furthermore, engagement in a touchscreen task, motivated by food reward, results in lower SWA during subsequent NREM sleep in both derivations, as compared to exploratory wakefulness, even though the total duration of wakefulness is similar. Conclusion Overall, our study suggests that sleep-wake behaviour is highly flexible within an individual and that the homeostatic processes that keep track of time spent awake are sensitive to the nature of the waking experience. We therefore conclude that sleep dynamics are determined, to a large degree, by the interaction between the organism and the environment.