Sleep-timing mismatch (MSFsc–lights-off interval) and its association with polysomnographic sleep parameters in a clinical population under a fixed laboratory schedule

Kultida Wongprakarnsanti

doi:10.1016/j.sleep.2026.109112

Sleep-timing mismatch (MSFsc–lights-off interval) and its association with polysomnographic sleep parameters in a clinical population under a fixed laboratory schedule

2026-07-07

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K

Kultida Wongprakarnsanti *

J

Jarturong Siritienthong

T

Tantawan Awirutworakul

C

Chakrit Sukying

P

Pattarabhon Wisajun

DOI：10.1016/j.sleep.2026.109112

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• Δt indexes the gap between habitual midsleep (MSFsc) and fixed PSG lights-off. • Each 1-h rise in Δt predicted longer SOL, lower SE, higher N1 and lower REM. • Effects held after adjusting for social jetlag, MSW, ΔTIB and FDR correction. • Continuous Δt outperformed categorical MSFsc in predicting sleep architecture. • Δt-related disruption was greatest in patients with later MSFsc (late tercile).

Sleep-timing mismatch (MSFsc–lights-off interval) and its association with polysomnographic sleep parameters in a clinical population under a fixed laboratory schedule

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