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. 2022 Aug 8;4:877234. doi: 10.3389/fdgth.2022.877234

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© 2022 Kamon, Okada, Furuta and Yosida.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Percentages of sleep stages determined by simple polysomnography (PSG) at ages in the range of 0–2 years. (B) Percentage of sleep stages determined by simple PSG at ages in the range of 3–6 years.