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A handful of walnuts a day: Nature's sleep aid?

NCT ID NCT06430086

Symptom relief Sponsor: Columbia University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jul 31, 2026 · Last updated Jul 31, 2026

Summary

This study tests whether adding walnuts to meals can improve sleep quality in middle-aged and older adults who report poor sleep. Walnuts contain melatonin and polyphenols, which may promote sleep. Participants will eat walnuts for 4 days and a high-sugar snack for 4 days, in random order, while sleep is measured with wrist monitors, questionnaires, and brain activity recordings. The trial aims to see if walnuts boost melatonin levels and lead to better sleep compared to the control food.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
walnuts
What this could lead to
If walnuts improve sleep, they could offer a natural, food-based way to enhance sleep quality in people with sleep complaints.
What could go wrong
This is a small, short-term study (24 people, 4 days per food) and results may not apply broadly. The effect on sleep may be modest or absent.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 24 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jun 2024

Expected to finish

Dec 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

45 to 65 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Equal numbers of men and women (12 male and 12 post-menopausal female) * Equal number of individuals with normal weight (18.5-24.9 kg/m2) and overweight (25-29.9 kg/m2) * Participants will self-report poor sleep quality, reflected by a global score \>5 on Pittsburgh Sleep Quality Index Exclusion Criteria: * Diagnosed sleep disorder * Participants with conditions that could affect sleep will be excluded: * smoking, excessive caffeine intake (\>300 mg/day) * shift work * chronic pain * diagnosis of a chronic disease (e.g., uncontrolled hypertension, pre-diabetes, type 2 diabetes, chronic kidney disease, chronic obstructive pulmonary disease), * autoimmune diseases * cardiovascular event or cancer in the past 24 months * psychiatric/neurologic disease or disorder, or sleep disorder (diagnosed or high risk for sleep apnea, chronic insomnia, restless leg syndrome, narcolepsy) * use of medications that influence CYP1A2 enzymes * Allergy/intolerance to nuts, tree nuts, or unwilling to eat study foods

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Poor sleep quality

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Columbia University Irving Medical Center

    RECRUITING

    New York, New York, 10032, United States

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