What question did this study set out to answer?

The study aims to investigate REM sleep microstructure to differentiate insomnia with and without PSG-defined abnormalities.

May 10, 2026SLEEP

0421 REM Sleep Arousability and Fragmentation in Insomnia With and Without PSG Abnormalities: A PANDORE-IA Study

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Randomized trial examines REM sleep patterns in insomnia, revealing distinct differences in arousal dynamics.

The study aims to investigate REM sleep microstructure to differentiate insomnia with and without PSG-defined abnormalities.
Analyzed REM sleep data from 1049 participants diagnosed with insomnia or as good sleepers according to ICSD-3 guidelines.
Utilized automated algorithms for precise scoring of sleep stages, arousals, and REM metrics.
Employed multinomial models to assess the relationship between insomnia subtypes and REM characteristics.
Both insomnia groups showed disrupted REM stability compared to good sleepers, indicated by increased arousals and awakenings.
CIN-AP had longer REM awakenings than CIN-NP, despite conventional PSG metrics being similar.
The classification model achieved an AUC of 0.755 when incorporating arousal dynamics and awakening duration.

Hanif et al. (2026) studied this question.

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