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Brief CBT-I improves insomnia symptoms in women receiving chemotherapy for breast cancer

In a randomized clinical trial of 219 women undergoing chemotherapy for breast cancer, 6 weeks of CBT-I significantly reduced insomnia symptoms (ISI score MD, -2.19 [95% CI, -3.33 to -1.05]; P=.002) compared to non-CBT-I groups. However, CBT-I did not significantly improve fatigue symptoms (PROMIS-Fatigue MD, -0.90 [95% CI, -3.08 to 1.28]; P=.52). Bright light therapy (BLT) did not significantly improve either insomnia or fatigue symptoms compared to non-BLT groups.

1 min read•Updated Aug 29, 2026•1 RCTs•View structured evidence →
Evidence Score44/100
Human RCT★★☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

This article is automatically generated from the structured evidence profile behind the claim above. Scores reflect the quality and quantity of available research, not clinical advice.

Brief CBT-I improves insomnia symptoms in women receiving chemotherapy for breast cancer The current body of evidence comprises 1 study, including 1 randomized controlled trial. EvidenceHub rates the overall confidence at 44/100 (low).

The Claim

Brief CBT-I improves insomnia symptoms in women receiving chemotherapy for breast cancer

This conclusion is most relevant to: Women (aged ≥18 years) receiving chemotherapy for early or metastatic breast cancer.

What the Research Shows

The conclusion draws on 1 linked study. Highlights from the cited literature:

  • ▸Cognitive Behavior vs Bright Light Therapy for Insomnia in Women Undergoing Chemotherapy for Breast Cancer: A Randomized Clinical Trial. (JAMA network open, 2026) — In a randomized clinical trial of 219 women undergoing chemotherapy for breast cancer, 6 weeks of CBT-I significantly reduced insomnia symptoms (ISI score MD, -2.19 [95% CI, -3.33 to -1.05]; P=.002) compared to non-CBT-I groups. However, CBT-I did not significantly improve fatigue symptoms (PROMIS-Fatigue MD, -0.90 [95% CI, -3.08 to 1.28]; P=.52). Bright light therapy (BLT) did not significantly improve either insomnia or fatigue symptoms compared to non-BLT groups.

How It Works

The proposed biological pathway:

  • ▸CBT-I addresses maladaptive sleep behaviors and cognitive arousal
  • ▸Behavioral components (e.g., stimulus control, sleep restriction) strengthen sleep drive
  • ▸Cognitive restructuring reduces anxiety about sleep
  • ▸Result: Reduced insomnia severity

Who Might Benefit

Evidence fit by population:

  • ▸Women (aged ≥18 years) receiving chemotherapy for early or metastatic breast cancer

Limitations & Caveats

Important context when interpreting this evidence:

  • ▸Fatigue was not improved by CBT-I, suggesting limited generalizability to fatigue outcomes
  • ▸Subgroup analysis for metastatic cancer was exploratory and not pre-specified
  • ▸High adherence subgroup results were comparable but not detailed in abstract
  • ▸Study was conducted in Australia, limiting generalizability to other healthcare settings

Frequently Asked Questions

Does CBT-I improve insomnia in breast cancer patients on chemotherapy?▼

Yes, the study found that 6 weeks of CBT-I significantly reduced insomnia symptoms (ISI score MD, -2.19 points) compared to non-CBT-I groups.

Does bright light therapy improve fatigue in breast cancer patients?▼

No, bright light therapy did not significantly improve fatigue symptoms compared to non-BLT groups in the overall sample. However, exploratory analysis in metastatic breast cancer patients showed a significant improvement in fatigue (MD, -5.16 points).

What was the study design?▼

It was a 6-week, 2x2 factorial, superiority, parallel randomized clinical trial conducted at 5 hospitals in Australia, with 219 women randomized to CBT-I alone, BLT alone, CBT-I plus BLT, or sleep hygiene education.

How long did the intervention last?▼

The intervention lasted 6 weeks, with assessments at baseline, midpoint (3 weeks), postintervention (6 weeks), and follow-up at 3 and 6 months.

References

  1. 1.Do TT, Maccora J, Wallace R, Aedo-Lopez V, Alexander M, Ancoli-Israel S, Bei B, Blum R, Boyle F, Day D, Diggens J, Francis PA, Ftanou M, Garland SN, Kepert A, Mortimer D, Phillips AJK, Sharma S, Stafford L, White M, Wiley JF. “Cognitive Behavior vs Bright Light Therapy for Insomnia in Women Undergoing Chemotherapy for Breast Cancer: A Randomized Clinical Trial..” JAMA network open, 2026. PMID: 42658497 DOI: 10.1001/jamanetworkopen.2026.30320
Disclaimer: This article is auto-generated from structured research data for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.