Tests a circadian lifestyle plan for adults with obesity and short sleep
Tests a plan limiting night light and late snacks in adults with obesity.
Plain-language title generated from the registry record
Registry title: Circadian Intervention to Improve Cardiometabolic Health
Key facts
- Where
- Salt Lake City, United StatesSee the site
AI summary: who the study is looking for
From the trial's eligibility criteria. Machine-read from the registry text on this page, so it can be wrong. The registry text below and the trial team decide who can take part.
The trial is looking for adults aged 18-45 with overweight or obesity who usually sleep less than 6.5 hours a night. It tests a daily-habit program about light at night and after-dinner snacks.
- Age
- 18-45 years
- Sex
- Men and women; the trial wants equal numbers of men and women.
- Disease stage
- Body mass index (BMI) 25.0-34.9 kg/m2. Usual sleep under 6.5 hours per night for the last 6 months.
- Earlier treatment
- Cannot be in a weight loss or physical activity program, such as the Diabetes Prevention Program.
Main reasons for not taking part
- A diagnosed sleep disorder or major psychiatric illness
- Significant organ disease, such as diagnosed diabetes, heart disease or kidney disease
- Shift work now or within the last year
- Weight change of more than 10% of body weight in the last six months
- Pregnant, planning pregnancy, breastfeeding, or in or past menopause
Read by machine on 9 November 2026.
Could this be for you?
Answer for yourself. This is not a decision: only the study team can say whether you can take part.
- Are you between 18 and 45 years old?
Source: NCT05943626, who can take part
Where in United States
- College of Health Research Complex--University of UtahSalt Lake City, United StatesTaking people
Questions to ask the study team
- How often do I need to come in, and for how long each time?
- Are travel costs paid?
- Can I keep my own doctor?
- What happens if I want to stop?
Trial details
- Who runs it
- University of Utah
- Trial code
- NCT05943626
- Record updated
- 5 August 2026
- Original description
The overall goal is to examine the efficacy of a circadian intervention in people with overweight and obesity and habitual short sleep duration (HSSD). Participants will undergo a randomized controlled trial, with circadian intervention and control (healthy lifestyle) groups. The circadian intervention is designed to reduce nighttime light exposure and after-dinner snack food intake. Alternatively, the control group will receive basic health information (e.g., physical activity, goal setting, and nutrition when eating out).Read full original descriptionShow less
Timing of Circadian Synchronizers: The TOCS Study
The overall goal is to examine the efficacy of a circadian intervention in people with overweight and obesity and habitual short sleep duration (HSSD). Participants will undergo a randomized controlled trial, with circadian intervention and control (healthy lifestyle) groups. The circadian intervention is designed to reduce nighttime light exposure and after-dinner snack food intake. Alternatively, the control group will receive basic health information (e.g., physical activity, goal setting, and nutrition when eating out).
Inclusion: Age: 18-45 years old; equal numbers of men and women; Body mass index (BMI): 25.0-34.9 kg/m2,; Sleep Habits: habitual self-reported average total sleep time (TST) <6.5 hours per night for prior 6 months.
Exclusion: Weight change: >10% of body weight over prior six months; Clinically diagnosed sleep disorder or major psychiatric illness; Evidence of significant organ dysfunction or disease (e.g., diagnosed diabetes, cardiovascular disease, or kidney disease); Shift-work: current or history of within last year; Current enrollment in weight loss or physical activity program like the Diabetes Prevention Program; Use of prescription drugs or substances known to influence sleep or glucose metabolism; Experiencing menopause or post-menopausal; Currently pregnant or planning to become pregnant, or currently lactating; Currently smoking; Alcohol intake >3 drinks per day or >14 drinks per week.