Sweet violet (Viola odorata) and sleep

What 4 graded rows on sweet violet (viola odorata) agree on for sleep, and where they differ. Counted side by side, never averaged.

Consensus finder Rows from the Sweet violet (Viola odorata) page, reviewed Oct 21, 2026 How it decides

What the rows agree on

Each block and row is one graded row from the Sweet violet (Viola odorata) page, with its PubMed record.

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Sleep4 Cough2

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Sweet violet (Viola odorata) and sleep

4 rows · 466 people

They agree: all 4 rows found an improvement.

No difference

Improved

Each block is one evidence row, sized by how many people it enrolled, with its grade inside.

Grade C× 3
Grade D× 1

Rows: 4
Trials: 8
People: 466; Pooled reviews may count some twice

What the rows share

From the rows

The best-graded row, grade C, is a meta-analysis of 224 people (2022) and found an improvement.

The rows run from 75 to 224 people, published from 2018 to 2024: 1 pooled review and 3 single studies.

The rows

4 improved

Grade CInsomnia scores across trials · Improved
Meta-analysis, 5 studies · n 224 · 2022 · Adults with chronic insomnia (5 trials)
Varied by trial · About 1 month
Total PSQI improved by 4.67 points and ISI by 6.30 points vs placebo; sleep latency, efficiency and daytime dysfunction did not differ significantly.
Row on the Sweet violet (Viola odorata) page · PubMed 35734476 (opens PubMed)
Grade CSleep quality in menopausal women · Improved
RCT · n 84 · 2024 · Menopausal women (Mashhad, Iran)
5 mL twice daily · 1 month
PSQI sleep score fell from 9.2 to 4.9 with violet syrup vs 8.4 to 8.1 with placebo (P < 0.001).
Row on the Sweet violet (Viola odorata) page · PubMed 38177831 (opens PubMed)
Grade CInsomnia in people with depression or OCD (add-on) · Improved
Pilot RCT · n 83 · 2020 · Adults with mild-moderate depression (40) or OCD (43) and insomnia (Tehran, Iran)
5 mL every 12 hours · 4 weeks
Total PSQI improved vs placebo in both the depression and OCD arms (p < 0.001); depression (BDI-II) and OCD (Y-BOCS) scores also improved.
Row on the Sweet violet (Viola odorata) page · PubMed 32073874 (opens PubMed)
Grade DChronic insomnia (nasal violet oil) · Improved
RCT · n 75 · 2018 · Adults with chronic insomnia (Mashhad, Iran)
3 drops per nostril nightly · 30 days
Insomnia Severity Index and PSQI improved in all three groups; the violet oil group improved most (between-group P < 0.002 and < 0.001).
Row on the Sweet violet (Viola odorata) page · PubMed 29217495 (opens PubMed)

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