What does this research mean for the field?

While actigraphy provides clinically meaningful group-level estimates of sleep parameters, wide interindividual variability and confounding by factors like age and periodic limb movements make it non-interchangeable with polysomnography. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the agreement between MotionWatch 8 actigraphy and inpatient polysomnography (PSG) across demographic and clinical factors in a sleep clinic cohort.

September 14, 2026Journal of Sleep ResearchOpen Access

Comparison of Actigraphy and Polysomnography in a Sleep Centre Cohort

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Authors

PDPanagis Drakatos IDIain Duncan LPLaura Pérez‐Carbonell

Discussion

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Overview

Cohort study reveals actigraphy overestimates sleep duration compared to polysomnography in sleep centre patients, indicating devices cannot be used interchangeably.

Key Points

To evaluate the agreement between MotionWatch 8 actigraphy and inpatient polysomnography (PSG) across demographic and clinical factors in a sleep clinic cohort.
Assessed 107 tertiary sleep centre patients (mean age 37.6 ± 14.9 years; 56% female).
Patients underwent inpatient PSG paired with eight nights of actigraphy monitoring, including the inpatient recording night.
Evaluated correlations, mean differences, 95% limits of agreement, and variations by age, periodic limb movements in sleep (PLMS), obstructive sleep apnea status, and psychiatric comorbidities.
Actigraphy significantly overestimated total sleep time (+27.31 min), sleep efficiency (+6.09%), and fragmentation index (+11.04 e/h) compared to PSG (p < 0.05), while underestimating wake after sleep onset (-14.86 min), with wide 95% limits of agreement for total sleep time (-96.78 to +151.40 min).
Correlations with PSG were strong for total sleep time (r = 0.728, p < 0.001) and moderate for sleep efficiency (r = 0.540, p < 0.001) and wake after sleep onset (r = 0.581, p < 0.001).
Older age increased overestimation of sleep duration, whereas PLMS (present in 17%) reduced sleep duration overestimation but exaggerated movement-derived sleep fragmentation (p < 0.05).

Cite This Study

Drakatos et al. (2026) studied this question.

synapsesocial.com/papers/6aa7b40e0926e14a848b37da https://doi.org/10.1111/jsr.70456

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September 14, 2026Journal of Sleep ResearchOpen Access

Comparison of Actigraphy and Polysomnography in a Sleep Centre Cohort

View Full Paper

Ask AI

Bookmark

Authors

PDPanagis Drakatos IDIain Duncan LPLaura Pérez‐Carbonell

Discussion

Member takes

Overview

Cohort study reveals actigraphy overestimates sleep duration compared to polysomnography in sleep centre patients, indicating devices cannot be used interchangeably.

Key Points

To evaluate the agreement between MotionWatch 8 actigraphy and inpatient polysomnography (PSG) across demographic and clinical factors in a sleep clinic cohort.
Assessed 107 tertiary sleep centre patients (mean age 37.6 ± 14.9 years; 56% female).
Patients underwent inpatient PSG paired with eight nights of actigraphy monitoring, including the inpatient recording night.
Evaluated correlations, mean differences, 95% limits of agreement, and variations by age, periodic limb movements in sleep (PLMS), obstructive sleep apnea status, and psychiatric comorbidities.
Actigraphy significantly overestimated total sleep time (+27.31 min), sleep efficiency (+6.09%), and fragmentation index (+11.04 e/h) compared to PSG (p < 0.05), while underestimating wake after sleep onset (-14.86 min), with wide 95% limits of agreement for total sleep time (-96.78 to +151.40 min).
Correlations with PSG were strong for total sleep time (r = 0.728, p < 0.001) and moderate for sleep efficiency (r = 0.540, p < 0.001) and wake after sleep onset (r = 0.581, p < 0.001).
Older age increased overestimation of sleep duration, whereas PLMS (present in 17%) reduced sleep duration overestimation but exaggerated movement-derived sleep fragmentation (p < 0.05).

Cite This Study

Drakatos et al. (2026) studied this question.

synapsesocial.com/papers/6aa7b40e0926e14a848b37da https://doi.org/10.1111/jsr.70456

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