A pilot study examining transcranial photobiomodulation therapy intervention in college students with insomnia

Dan Liang; Haoda Wang; Hui Xie; Jiangshan He; Lei Zheng; Lianghua Zhang; Mingzhe Jiang; Qiyuan Cheng; Tianyi Luo; Xiaoyu Wang

arxiv: 2606.24668 · v1 · pith:M4BI67LPnew · submitted 2026-06-23 · 🧬 q-bio.NC · stat.OT

A pilot study examining transcranial photobiomodulation therapy intervention in college students with insomnia

Jiangshan He , Lianghua Zhang , Dan Liang , Xiaoyu Wang , Tianyi Luo , Haoda Wang , Ziqi Ren , Mingzhe Jiang

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Lei Zheng Qiyuan Cheng Hui Xie Xueli Chen

This is my paper

Pith reviewed 2026-06-25 21:34 UTC · model grok-4.3

classification 🧬 q-bio.NC stat.OT

keywords insomniatranscranial photobiomodulationprefrontal cortexcollege studentshyperarousal modelpilot studysleep quality

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The pith

Transcranial photobiomodulation targeting the prefrontal cortex shows preliminary support for treating insomnia in college students.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

College students experience high rates of insomnia, with roughly 30 percent meeting diagnostic criteria, which threatens their physical growth, cognitive development, and well-being while creating economic costs. The hyperarousal model ties these problems to prefrontal hypoactivity that fails to exert top-down control over limbic reactivity and brainstem arousal. Transcranial photobiomodulation therapy has already shown benefits in neuropsychiatric conditions that frequently co-occur with insomnia, suggesting the same prefrontal target could restore regulatory function in insomnia itself. This pilot study tests that application directly in affected students.

Core claim

Transcranial photobiomodulation therapy targeting the prefrontal cortex has demonstrated therapeutic efficacy across neuropsychiatric disorders with insomnia comorbidities, providing preliminary support for its application in insomnia.

What carries the argument

transcranial photobiomodulation (tPBM) therapy targeting the prefrontal cortex to restore top-down modulatory control over limbic reactivity and brainstem arousal nuclei

If this is right

If the therapy works, it could lower the societal economic burden associated with student insomnia.
Successful application would improve physical growth, cognitive development, and overall well-being for the affected student population.
The approach would offer a non-pharmacological route to address the neural substrate of hyperarousal in insomnia.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

Researchers could next measure prefrontal activity directly before and after sessions to clarify the mechanisms that the paper notes remain unknown.
The same prefrontal target might be tested in other groups whose insomnia is also linked to prefrontal hypoactivity.
Combining tPBM with existing behavioral treatments for insomnia could be examined for additive effects.

Load-bearing premise

Prefrontal hypoactivity is a causal driver of insomnia symptoms that can be reversed by tPBM to produce clinical improvement.

What would settle it

A randomized controlled trial in college students with insomnia that finds no greater improvement in sleep measures after active tPBM than after sham treatment.

read the original abstract

College students commonly report insufficient sleep and poor sleep quality, with ~30% meeting insomnia criteria, posing significant threats to their physical growth, cognitive development, and overall well-being, as well as imposing a substantial economic burden on society [1]. The hyperarousal model of insomnia [2] emphasizes that hyperarousal across cognitive, emotional, and physiological domains mutually reinforces one another. Neuroimaging studies have further identified prefrontal hypoactivity as a key neural substrate underlying these dysfunctional cognitions and elevated arousal, reflecting a failure of top-down modulatory control over both limbic reactivity [3] and brainstem arousal nuclei [4]. Moreover, transcranial photobiomodulation (tPBM) therapy targeting the prefrontal cortex has demonstrated therapeutic efficacy across neuropsychiatric disorders with insomnia comorbidities [5,6], providing preliminary support for its application in insomnia. However, the neuro mechanisms underlying tPBM's therapeutic effects on insomnia remain to be elucidated.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

This is background rationale for testing tPBM on student insomnia but reports no pilot data or results.

read the letter

The key point is that the abstract lays out a rationale for using transcranial photobiomodulation targeting prefrontal cortex in college students with insomnia, drawing on the hyperarousal model and prior tPBM work in related disorders, yet it contains no participant details, methods, outcomes, or statistics from the pilot itself.

The paper does a clear job summarizing existing links between prefrontal hypoactivity, top-down control failures, and insomnia symptoms, and it correctly flags that the mechanisms for tPBM effects on insomnia are still unknown. That honesty about the gap is useful.

The soft spot is the absence of any new empirical content. The claim of preliminary support rests only on citations to other conditions, not on data from this study. Without results, there is no way to check whether the assumed causal path from tPBM to reduced hyperarousal actually appears in this population. The stress-test note about the untested assumption holds up based on what is shown.

This would mainly interest researchers already working on non-invasive stimulation for sleep or student mental health. A reader wanting evidence of efficacy will not find it here. It shows clear engagement with the literature but does not yet constitute a completed pilot report.

I would not bring it to a reading group or cite it. A serious editor should desk reject unless the full manuscript supplies actual study execution, data, and analysis that can be evaluated.

Referee Report

2 major / 1 minor

Summary. The manuscript, titled as a pilot study on transcranial photobiomodulation (tPBM) for insomnia in college students, provides background on insomnia prevalence (~30% in students), the hyperarousal model, prefrontal hypoactivity as a neural substrate, and cites tPBM efficacy in comorbid neuropsychiatric disorders as preliminary support for its use in insomnia, while noting that neuro mechanisms remain to be elucidated. No participant data, intervention protocol, outcome measures, or statistical results from the pilot are reported.

Significance. A successful demonstration of tPBM efficacy would address a common student health issue with a non-invasive approach, but the absence of any empirical findings means the manuscript contributes no new evidence on efficacy, mechanisms, or feasibility.

major comments (2)

[Abstract] Abstract: The claim that tPBM 'has demonstrated therapeutic efficacy across neuropsychiatric disorders with insomnia comorbidities, providing preliminary support for its application in insomnia' is unsupported, as the manuscript reports no pilot study data linking tPBM to insomnia outcomes or prefrontal changes.
[Abstract] Abstract (and overall manuscript): No details are given on study design, sample size, tPBM parameters (wavelength, duration, targeting), insomnia assessment tools, or any pre/post measures, which are required to evaluate the pilot study's central claim of examining the intervention.

minor comments (1)

The text ends abruptly after stating mechanisms 'remain to be elucidated' without transitioning to methods or results, inconsistent with the 'pilot study' title.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful review and for highlighting the gaps in the submitted manuscript. We acknowledge that the version under review contains only background and rationale without the methods, participant details, intervention parameters, or empirical results from the pilot study. This omission was unintentional, and we will prepare a revised manuscript that incorporates the full pilot study description and findings to address the concerns.

read point-by-point responses

Referee: [Abstract] Abstract: The claim that tPBM 'has demonstrated therapeutic efficacy across neuropsychiatric disorders with insomnia comorbidities, providing preliminary support for its application in insomnia' is unsupported, as the manuscript reports no pilot study data linking tPBM to insomnia outcomes or prefrontal changes.

Authors: We agree that the cited claim in the abstract lacks direct support from the pilot data in the submitted version. In revision, we will qualify the statement to reflect the existing literature citations only and add a concise summary of the pilot results demonstrating changes in insomnia severity and prefrontal measures. revision: yes
Referee: [Abstract] Abstract (and overall manuscript): No details are given on study design, sample size, tPBM parameters (wavelength, duration, targeting), insomnia assessment tools, or any pre/post measures, which are required to evaluate the pilot study's central claim of examining the intervention.

Authors: The referee is correct that the submitted manuscript omits all methodological and results details required for a pilot study report. We will expand the manuscript to include the study design, sample size, tPBM parameters, assessment instruments, and pre/post outcome measures so that the central claim can be properly evaluated. revision: yes

Circularity Check

0 steps flagged

No circularity: empirical pilot study with no derivations or self-referential predictions

full rationale

The paper is a clinical pilot study reporting an intervention trial. The provided abstract and setup contain no equations, fitted parameters, predictions derived from inputs, or load-bearing self-citations. Background claims cite external references [1-6] for the hyperarousal model and prior tPBM efficacy, while explicitly noting that neuro mechanisms remain to be elucidated. No step reduces a claimed result to its own inputs by construction, and the central premise relies on independent external literature rather than internal circular constructions. This is a standard non-finding for an empirical report without theoretical derivation chains.

Axiom & Free-Parameter Ledger

0 free parameters · 3 axioms · 0 invented entities

The central rationale rests on three established domain assumptions drawn from the cited literature rather than new postulates or fitted parameters introduced by the paper.

axioms (3)

domain assumption Hyperarousal model of insomnia in which cognitive, emotional, and physiological hyperarousal mutually reinforce one another
Invoked in the first paragraph and cited as reference [2]
domain assumption Prefrontal hypoactivity is a key neural substrate underlying dysfunctional cognitions and elevated arousal
Stated as identified by neuroimaging studies and cited as [3,4]
domain assumption tPBM targeting the prefrontal cortex has demonstrated therapeutic efficacy across neuropsychiatric disorders with insomnia comorbidities
Cited as [5,6] to provide preliminary support

pith-pipeline@v0.9.1-grok · 5732 in / 1320 out tokens · 36261 ms · 2026-06-25T21:34:42.147736+00:00 · methodology

discussion (0)

Reference graph

Works this paper leans on

7 extracted references · 7 canonical work pages

[1]

A systematic review and meta-analysis of poor sleep, insomnia symptoms and stress in undergraduat e students

Gardani, M, D R R Bradford, K Russell, S Allan, L Beattie, J G Ellis, U Akram. A systematic review and meta-analysis of poor sleep, insomnia symptoms and stress in undergraduat e students. Sleep Med Rev 2022;61101565. https://doi.org/10.1016/j.smrv.2021.101565

work page doi:10.1016/j.smrv.2021.101565 2022
[2]

Brain mechanisms of insomnia: new perspectives on causes and consequences

Van Someren, E J W. Brain mechanisms of insomnia: new perspectives on causes and consequences. Physiol Rev 2021;101(3):995 –1046. https://doi.org/10.1152/physrev.00046.2019

work page doi:10.1152/physrev.00046.2019 2021
[3]

The emotional component of insomnia disorder: A focus on emotion regulation and affect dynamics in relation to sleep quality and insomnia

Meneo, D, F Samea, M Tahmasian, C Baglioni. The emotional component of insomnia disorder: A focus on emotion regulation and affect dynamics in relation to sleep quality and insomnia. J Sleep Res 2023;32(6):e13983. https://doi.org/10.1111/jsr.13983

work page doi:10.1111/jsr.13983 2023
[4]

Covariance patterns between sleep health domains and distributed intrinsic functional connectivity

Wang, Y , S Genon, D Dong, F Zhou, C Li, D Yu, K Y uan, Q He, J Qiu, T Feng, H Chen, X Lei. Covariance patterns between sleep health domains and distributed intrinsic functional connectivity. Nat Commun 2023;14(1):7133. https://doi.org/10.1038/s41467-023-42945-5

work page doi:10.1038/s41467-023-42945-5 2023
[5]

Wearable, self -administered transcranial photobiomodulation for major depressive disorder and sleep: A randomized, double blind, sham-controlled trial

Guu, T -W, P Cassano, W -J Li, Y -H Tseng, W -Y Ho, Y -T Lin, S -Y Lin, J P -C Chang, D Mischoulon, K -P Su. Wearable, self -administered transcranial photobiomodulation for major depressive disorder and sleep: A randomized, double blind, sham-controlled trial. J Affect Disord 2025;372635–642. https://doi.org/10.1016/j.jad.2024.12.065

work page doi:10.1016/j.jad.2024.12.065 2025
[6]

Brain Photobiomodulation Improves Sleep Quality in Subjective Cognitive Decline: A Randomized, Sham -Controlled Study

Zhao, X, W Du, J Jiang, Y Han. Brain Photobiomodulation Improves Sleep Quality in Subjective Cognitive Decline: A Randomized, Sham -Controlled Study. J Alzheimers Dis 2022;87(4):1581–1589. https://doi.org/10.3233/JAD-215715

work page doi:10.3233/jad-215715 2022
[7]

The neural bases of emotion regulation

Etkin, A, C Büchel, J J Gross. The neural bases of emotion regulation. Nat Rev Neurosci 2015;16(11):693–700. https://doi.org/10.1038/nrn4044 This work was supported by the National Natural Science Foundation of China (Grant No. 62275210, 62506286), the National Leading Talent Program, the National Young Talent Program, the Postdoctoral Fellowship Program ...

work page doi:10.1038/nrn4044 2015

[1] [1]

A systematic review and meta-analysis of poor sleep, insomnia symptoms and stress in undergraduat e students

Gardani, M, D R R Bradford, K Russell, S Allan, L Beattie, J G Ellis, U Akram. A systematic review and meta-analysis of poor sleep, insomnia symptoms and stress in undergraduat e students. Sleep Med Rev 2022;61101565. https://doi.org/10.1016/j.smrv.2021.101565

work page doi:10.1016/j.smrv.2021.101565 2022

[2] [2]

Brain mechanisms of insomnia: new perspectives on causes and consequences

Van Someren, E J W. Brain mechanisms of insomnia: new perspectives on causes and consequences. Physiol Rev 2021;101(3):995 –1046. https://doi.org/10.1152/physrev.00046.2019

work page doi:10.1152/physrev.00046.2019 2021

[3] [3]

The emotional component of insomnia disorder: A focus on emotion regulation and affect dynamics in relation to sleep quality and insomnia

Meneo, D, F Samea, M Tahmasian, C Baglioni. The emotional component of insomnia disorder: A focus on emotion regulation and affect dynamics in relation to sleep quality and insomnia. J Sleep Res 2023;32(6):e13983. https://doi.org/10.1111/jsr.13983

work page doi:10.1111/jsr.13983 2023

[4] [4]

Covariance patterns between sleep health domains and distributed intrinsic functional connectivity

Wang, Y , S Genon, D Dong, F Zhou, C Li, D Yu, K Y uan, Q He, J Qiu, T Feng, H Chen, X Lei. Covariance patterns between sleep health domains and distributed intrinsic functional connectivity. Nat Commun 2023;14(1):7133. https://doi.org/10.1038/s41467-023-42945-5

work page doi:10.1038/s41467-023-42945-5 2023

[5] [5]

Wearable, self -administered transcranial photobiomodulation for major depressive disorder and sleep: A randomized, double blind, sham-controlled trial

Guu, T -W, P Cassano, W -J Li, Y -H Tseng, W -Y Ho, Y -T Lin, S -Y Lin, J P -C Chang, D Mischoulon, K -P Su. Wearable, self -administered transcranial photobiomodulation for major depressive disorder and sleep: A randomized, double blind, sham-controlled trial. J Affect Disord 2025;372635–642. https://doi.org/10.1016/j.jad.2024.12.065

work page doi:10.1016/j.jad.2024.12.065 2025

[6] [6]

Brain Photobiomodulation Improves Sleep Quality in Subjective Cognitive Decline: A Randomized, Sham -Controlled Study

Zhao, X, W Du, J Jiang, Y Han. Brain Photobiomodulation Improves Sleep Quality in Subjective Cognitive Decline: A Randomized, Sham -Controlled Study. J Alzheimers Dis 2022;87(4):1581–1589. https://doi.org/10.3233/JAD-215715

work page doi:10.3233/jad-215715 2022

[7] [7]

The neural bases of emotion regulation

Etkin, A, C Büchel, J J Gross. The neural bases of emotion regulation. Nat Rev Neurosci 2015;16(11):693–700. https://doi.org/10.1038/nrn4044 This work was supported by the National Natural Science Foundation of China (Grant No. 62275210, 62506286), the National Leading Talent Program, the National Young Talent Program, the Postdoctoral Fellowship Program ...

work page doi:10.1038/nrn4044 2015