Research · Randomized controlled trial
A double-blind, placebo-controlled investigation of the effects of Passiflora incarnata (passionflower) herbal tea on subjective sleep quality
What it found
Subjective sleep quality was rated significantly better on passionflower than placebo over one week — a small short-term benefit.
- Design
- Randomized controlled trial
- Year
- 2011
- Sample size
- 41
- Population
- healthy adults aged 18–35 with mild fluctuations in sleep quality
- Intervention
- passionflower herbal tea nightly for 1 week vs placebo tea (crossover)
- Outcome
- subjective sleep quality (sleep diary)
- Journal
- Phytotherapy Research
Citation last checked 2026-06-21.