Clinical trials
Circadian Rhythm clinical trials
Below are recruiting circadian rhythm clinical trials, each written for real people, not researchers. We’re tracking 69 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT07317349Recruiting
A study on how a daily time shift affects body rhythms in couples
This study looks at how a small, consistent delay in your daily schedule affects your body's internal clock. It involves you and your partner staying together in a lab for five days.
AarhusAges 23–45 - NCT05107947Recruiting
Dynamic room lighting to improve sleep and daily body rhythm
This study tests whether changing the light in a hospital room can improve sleep and help your body clock work better in older adults. It may be most helpful if sleep problems or irregular daily rhythms are affecting you in the hospital.
MalmöAges 65 years+ - NCT07753889Recruiting
Light, sleep, and body clock study for adults
This study looks at how your eyes react to light and how that relates to your sleep and daily body rhythms. It may help researchers understand sleep problems and find better ways to treat them.
Boston, MassachusettsAges 18–85 - NCT06192745Recruiting
Sleep and screen time study for kids 8 to 11
This study looks at how screen time in the evening affects sleep and body clocks in children. It may help families understand how to create healthier bedtime habits.
Houston, TexasAges 8–11 - NCT05446636Recruiting
Circadian rhythm study for pain after C-section
This study looks at whether your body’s daily rhythm (“circadian rhythm”) is linked to pain after an elective C-section using spinal anesthesia. If you join, you’ll be monitored after surgery to see whether timing or rhythm-related factors change your pain.
Chongqing, Chongqing MunicipalityAges 20–45 - NCT07744711Enrolling by invitation
Testing a light therapy app on an iPad
This study tests an iPad app that provides light therapy, which may help with conditions like seasonal depression or sleep problems. You will use the app for a period of time, and you may also choose to provide blood samples for a biomarker sub-study.
New York, New YorkAges 18 years+ - NCT06743373Recruiting
Cannabis and sleep in young adults
This study looks at how cannabis affects sleep, daily rhythms, and sensitivity to light in young adults. You would either stop using cannabis for 4 weeks (if you are a regular user) or serve as a non-user control, to compare sleep patterns.
Pittsburgh, PennsylvaniaAges 18–25 - NCT07294781Recruiting
Circadian rhythm study in healthy adults during wakefulness
This study explores how your internal body clock and sense of time change during 36 hours of staying awake. You will stay in a lab and complete simple tasks to help researchers understand the link between circadian rhythms and time perception.
AarhusAges 23–45 - NCT06471374Recruiting
Circadian rhythm in delayed sleep-wake phase disorder
This study looks at how your body's internal clock works in people with delayed sleep-wake phase disorder, especially those living at high altitudes. It aims to understand the causes of this sleep problem and may help find better treatments.
Boulder, ColoradoAges 16–40 - NCT07702344Recruiting
Shift work and your body's daily rhythm
This study looks at how shift work affects your body's natural daily rhythm (circadian rhythm) and overall health. It may help find ways to support the health of shift workers like you.
IstanbulAges 18–65 - NCT06544018Recruiting
Sleep and body clock study for CAPS patients and family members
This study looks at how CAPS (a genetic condition that causes inflammation) affects sleep and daily body rhythms. It compares people with CAPS to healthy family members living in the same home, to understand differences without any treatment being tested.
BronAges 6 years+ - NCT04966351Recruiting
Study countermeasures for disrupted body clock timing
This study tests ways to help your body’s internal clock stay in sync when your sleep timing is off. It’s looking for healthy adults with fairly regular sleep and certain lifestyle and location history.
Fort Collins, ColoradoAges 18–35 - NCT06296823Recruiting
Daily rhythms in healthy young adults
This study looks at how your body's daily rhythms (your internal clock) work by measuring natural chemicals in your body. It's for healthy people aged 17-35 who live at or above Denver's altitude.
Boulder, ColoradoAges 17–35 - NCT07329283Recruiting
Nighttime nutrition and sleep health study
This study looks at how eating at night affects your sleep and body clock. You will spend two nights in a sleep lab to test the effects of a small meal before bed.
Salt Lake City, UtahAges 18–35 - NCT05184933Recruiting
Study sleep timing and blood pressure patterns in adults
This study looks at how your sleep schedule and body clock relate to blood pressure control. You may be asked to follow a study plan that helps researchers understand what sleep and daily timing changes do to hypertension.
Portland, OregonAges 25–64 - NCT04743271Recruiting
Test how food timing affects the body’s daily rhythms
This study looks at how the timing of meals (and daily timing habits) affects your body’s natural clock and related health measures. It involves healthy, generally low-risk participants and may help researchers understand how timing affects metabolism and sleep.
Portland, OregonAges 18–40 - NCT07138313Recruiting
How diet affects sleep and daily rhythms
This study looks at how what you eat affects your sleep and daily rhythms. Healthy young adults aged 18-32 are invited to join to help researchers understand this connection.
UppsalaAges 18–32 - NCT05807178Recruiting
Light treatment to stabilize sleep-wake rhythm in ICU delirium
This trial tests whether controlled bright light in the ICU can improve confusion and the sleep-wake rhythm in adults who develop delirium. If it works, it may help patients become more clear-minded sooner while they recover in intensive care.
BerlinAges 18 years+ - NCT05656768Enrolling by invitation
Study how sleep affects nighttime blood pressure
This study looks at how sleep timing and sleep patterns may change your blood pressure at night. If you are already enrolled in the parent research study, you may be invited to take part here.
Birmingham, AlabamaAges 18 years+ - NCT07292597Recruiting
Circadian timing and time perception study for healthy adults
This trial looks at how your internal body clock affects the way you perceive time. It may help you understand your own sleep patterns and daily rhythms better.
AarhusAges 23–45 - NCT05247125RecruitingPhase 4
Testing light or melatonin to help brain recovery after stroke
This study looks at whether changing your sleep timing using light therapy or melatonin can improve “brain rewiring” after an ischemic stroke. It mainly focuses on people who arrive very soon after stroke symptoms and who also meet specific safety and sleep/medication requirements.
Saint PetersburgAges 18–80 - NCT07049783Recruiting
How exercise timing affects blood pressure response
This study looks at how the time of day you exercise affects your blood pressure response. It is for young adults with slightly elevated blood pressure who are generally healthy, not on certain medications, and do not have sleep or chronic health issues.
Newark, DelawareAges 18–39 - NCT05551325Recruiting
Resetting sleep timing for ICU patients to support recovery
This study tests a “sleep chronobundle,” a set of sleep and light-timing steps, to improve daily sleep-wake timing in people in the ICU on breathing or blood-pressure support. It also checks whether the body’s sleep rhythms are more aligned during critical illness and over time.
New Haven, ConnecticutAges 18 years+ - NCT07339592Enrolling by invitation
How meal timing affects sleep in medical residents
This study tests whether changing when and what you eat for two weeks can improve sleep quality and how your body's natural clock works. It is for medical residents in Jordan who do not have chronic health issues or sleep disorders.
AmmanAges 25 years+
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Circadian Rhythm trials by city
Studies with a site in or near these metro areas.
Circadian Rhythm trials by state
Studies with a site anywhere in these states.
Common questions
- Are there clinical trials for circadian rhythm?
- Yes. Clin2 currently lists 69 recruiting circadian rhythm studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a circadian rhythm trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a circadian rhythm trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.