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Light bulbs might help Alzheimer's patients sleep better and control blood sugar

NCT ID NCT03777722

Symptom relief Sponsor: Icahn School of Medicine at Mount Sinai Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested whether a special type of lighting, called a tailored lighting intervention, could help people with mild to moderate Alzheimer's disease and type 2 diabetes sleep better and improve their metabolism. Sixty-one participants living in assisted living or nursing homes were exposed to either the active lighting or a placebo light for 8 weeks. The goal was to see if the light could reset their internal body clocks, leading to better sleep, mood, and blood sugar control.

What this could mean

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

Active substance
tailored lighting intervention (special light bulbs/fixtures)
What this could lead to
If it works, this could offer a simple, drug-free way to improve sleep and metabolic health in people with Alzheimer's disease.
What could go wrong
This is a small, early-stage study with only 61 participants. The lighting may not work for everyone, and results may not apply to people with severe vision problems or insulin-dependent diabetes.

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

61 people

The number who actually took part.

Started

Nov 2018

Finished

May 2025

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

55 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * Diagnosis of mild to moderate Alzheimer's disease or related dementia, * sleep disturbance as determined by a score ≥ 5 on the PSQI Exclusion Criteria: * insulin-dependent diabetes, * urinary incontinence * obstructing cataracts * macular degeneration * blindness * severe sleep apnea or * restless leg syndrome (RLS)

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Conditions

The condition(s) this trial relates to.

Alzheimer disease type 2 diabetes mellitus

As listed by the trial registrant

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

Alzheimer disease Diabetes mellitus type 2

Contacts and locations

Locations

  • Icahn School of Medicine

    New York, New York, 10029, United States

  • Icahn School of Medicine at Mount Sinai

    Albany, New York, 12204, United States

  • Rutgers University

    New Brunswick, New Jersey, 08854, United States

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