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. 2023 Jul 6;15:533–546. doi: 10.2147/NSS.S415464

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© 2023 Feng et al.

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Sleep structure of the four groups; (A) time and (B) percentage.

Abbreviations: H-SR or L-SR, high or low sleep reactivity; N1–3, non-rapid eye movement sleep stage 1–3; REM, rapid eye movement sleep.