| Not Yet Recruiting | Chrononutrition in Preterm Infants: a Randomised Controlled Trial of Time-matched Breast Milk Feeding and Its NCT07533578 | Luzerner Kantonsspital | N/A |
| Not Yet Recruiting | Early Pregnancy Lifestyle and Glucose Patterns: A Substudy of TOFFFY NCT07534670 | KK Women's and Children's Hospital | N/A |
| Not Yet Recruiting | Sleep Loss and Circadian Misalignment - Mechanisms of Insulin Resistance NCT07494084 | Washington State University | Phase 4 |
| Not Yet Recruiting | THE EFFECTS OF CIRCADIAN RHYTHM-BASED PROGRESSIVE RELAXATION EXERCISES IN HEMODIALYSIS PATIENTS NCT07499297 | Karamanoğlu Mehmetbey University | N/A |
| Not Yet Recruiting | Effect of Esketamine on Postoperative Sleep in Postmenopausal Women NCT07315074 | Zhuan Zhang | N/A |
| Not Yet Recruiting | Investigating the Effects of Time-of-day and Menstrual Cycle Phase (Low and High Progesterone) on Female's Cog NCT07399847 | Lancaster University | — |
| Not Yet Recruiting | A Longitudinal Follow-Up Study on Predicting Major Depressive Disorder From Rest-Activity Rhythm Profiles NCT07388849 | Chinese University of Hong Kong | — |
| Not Yet Recruiting | Circadian Rhythm Monitoring Study NCT07336654 | ResMed | N/A |
| Not Yet Recruiting | Chrono-ALIGN: A Chronotype-Based Chrono-Nutrition Intervention in Post-Bariatric Patients NCT07324044 | King Saud University | N/A |
| Not Yet Recruiting | Hyperthermia in Patients With Chronic Primary Pain - Effects on Thermoregulation, Somatosensory System and Mov NCT07101978 | Bern University of Applied Sciences | N/A |
| Not Yet Recruiting | Pain Perception and Exercise-Induced Hypoalgesia Across Circadian Rhythms NCT07290465 | Medipol University | N/A |
| Recruiting | Nighttime Synchrony of Your Nutrition and Circadian Health NCT07329283 | University of Utah | N/A |
| Recruiting | Circadian Rhythms and Time Perception in Healthy Adults During Constant Wakefulness NCT07294781 | University of Aarhus | N/A |
| Not Yet Recruiting | Resistance Exercise and Sleep Quality by Chronotype NCT07234812 | Medipol University | N/A |
| Enrolling By Invitation | This Trial Examines How Last Meal Composition and Timing Affect Sleep Quality and Circadian Gene Expression Am NCT07339592 | University of Jordan | N/A |
| Recruiting | Feasibility of Wearables in Dementia Care in Rural Taiwan NCT07249918 | China Medical University Hospital | N/A |
| Not Yet Recruiting | Evaluating the Efficacy and Safety of PROSOMNIA Sleep Therapy™ in Patients With Sleep Deprivation and Chronic NCT06644573 | Nyree Penn | Phase 1 |
| Recruiting | Circadian Timing and Time Perception in Healthy Adults NCT07292597 | University of Aarhus | N/A |
| Not Yet Recruiting | Nocturnal Blood Pressure Dipping and Ventricular Repolarization in Hypertension NCT07200856 | Assiut University | — |
| Recruiting | Dietary Impact on Sleep, Rhythms and Related Physiology NCT07138313 | Uppsala University | N/A |
| Recruiting | Examining the Circadian Timing Effects of the Hypotensive Response to Exercise NCT07049783 | Freda Patterson | N/A |
| Completed | Time-restricted Feeding and Health NCT07505680 | Harokopio University | N/A |
| Recruiting | Cannabis Effects on Sleep, Circadian Rhythms, and Light Sensitivity in Young Adults NCT06743373 | University of Pittsburgh | N/A |
| Enrolling By Invitation | Sleep Survey for Medical Trainees NCT06706453 | King's College London | — |
| Not Yet Recruiting | The Effect of General Anesthesia with Remimazolam and Propofol on Rhythmic State and Cognitive Function NCT06775366 | The Second Affiliated Hospital of Chongqing Medical University | N/A |
| Completed | Effects of Inspiratory Muscle Training Combined With Circadian Rhythm-based Running Programs in Children Male NCT07170891 | Gümüşhane Universıty | N/A |
| Completed | MorphECOS - Evaluation of the Influence of Fatigue and Sleep on the Performance of 2nd Cycle Medical Students NCT06952972 | Claude Bernard University | — |
| Recruiting | SCREENS: Sleep, Circadian Rhythms, and Electronics in the EveNing Study NCT06192745 | Baylor College of Medicine | N/A |
| Not Yet Recruiting | Timing and Resistance Exercise: Impact on Eating and Metabolism NCT06549322 | National Taiwan Normal University | N/A |
| Recruiting | Impact of Evening Snacks and Pre-Breakfast Intake on Sleep, Heart Rate Variability, and Stress Markers in Heal NCT06480305 | Riphah International University | N/A |
| Recruiting | Idiopathic Scoliosis New Onset and Melatonin Phase Delay in Children NCT06502613 | Second Affiliated Hospital of Wenzhou Medical University | — |
| Recruiting | The Influence of Sleep on Cardiovascular Outcomes NCT06535178 | Oregon Health and Science University | N/A |
| Unknown | Determining Circadian Metabolic and Behavioural Rhythms in Patients with and Without Type 2 Diabetes NCT06243172 | Steno Diabetes Center Copenhagen | — |
| Recruiting | Time to Move in Pregnancy Hyperglycemia NCT06125704 | The University of Tennessee, Knoxville | N/A |
| Completed | Effects of Meal Energy Density on Body Measures and Metabolism in Women NCT07066618 | Melike Nur Eroğlu | N/A |
| Completed | Donor Circadian Rhythm and Its Correlation With Prognosis After Heart Transplantation NCT07301788 | Union Hospital, Tongji Medical College, Huazhong University of Science and Technology | — |
| Recruiting | Acupressure Therapy on Post-stroke Fatigue, Depression, and Sleep Disturbances in Ischemic Stroke Patients NCT06401837 | China Medical University Hospital | N/A |
| Completed | Effect of Suanzaoren Decoction and Huanglian Wendan Decoction on Biorhythm of Insomnia Patients NCT06467851 | The First Affiliated Hospital with Nanjing Medical University | N/A |
| Completed | Effect of Continuous Versus Cyclic Daytime Enteral Nutrition on Circadian Rhythms in Critical Illness NCT05795881 | Leiden University Medical Center | N/A |
| Enrolling By Invitation | Sleep and Circadian Contributions to Nighttime Blood Pressure NCT05656768 | University of Alabama at Birmingham | N/A |
| Recruiting | Circadian Time Restricted Eating NCT05628012 | Oregon Health and Science University | N/A |
| Recruiting | Circadian Rhythm Status and CS (Cesarean Section) Postoperative Pain NCT05446636 | The Second Affiliated Hospital of Chongqing Medical University | — |
| Recruiting | Light in Frail Elderly - the Effect of a Dynamic Light for Sleep and Circadian Rhythm NCT05107947 | Region Skane | N/A |
| Completed | The Effect of Nursing Care on Circadian Rhythm NCT04934436 | Sakarya University | N/A |
| Recruiting | Light Timing Study NCT04753190 | Rush University Medical Center | N/A |
| Completed | Effects of Melatonin Supplementation on Sleep Quality in Patients With Advanced Glaucoma NCT06868745 | University of Sao Paulo | N/A |
| Recruiting | Food and Circadian Timing NCT04743271 | Oregon Health and Science University | N/A |
| Completed | Circadian Rhythm and Delirium in ICU NCT05342987 | Shanghai Zhongshan Hospital | — |
| Unknown | The Effect of Circadian Rhytm on Postoperative Pain Undergoing Pediatric Surgery NCT05379192 | Faruk Cicekci | — |
| Completed | Circadian Rhythm and Metabolic Effects of Exercise NCT05115682 | Karolinska Institutet | N/A |
| Unknown | Effect of Circadian Rhythm on Brain NAD Measured by Phosphorus Magnetic Resonance Spectroscopy at 7 Tesla NCT05093088 | Ecole Polytechnique Fédérale de Lausanne | — |
| Completed | Teen Sleep and Light Study NCT04921215 | Rush University Medical Center | N/A |
| Completed | Treatment of Chronic Insomnia According to Yin Yang Theory and Its Correlation With Circadian Rhythm NCT05452577 | The First Affiliated Hospital with Nanjing Medical University | N/A |
| Completed | Insomnia Treated by Traditional Chinese Medicine and Its Circadian Rhythm NCT04448197 | The First Affiliated Hospital with Nanjing Medical University | — |
| Completed | Effects of Light and Sound Modification on Sleep Quality and Circadian Rhythm in the MICU Patients NCT04129918 | Shin Kong Wu Ho-Su Memorial Hospital | N/A |
| Completed | Circadian Mechanisms Underlying Non-Dipping Blood Pressure in Blacks NCT03934255 | University of Alabama at Birmingham | N/A |
| Completed | CircaHealth Development and Evaluation NCT03835572 | University of Miami | N/A |
| Completed | Interaction of Melatonin With MTNR1B Genotype on Glucose Control - Study 2 NCT03464084 | Brigham and Women's Hospital | N/A |
| Completed | Progesterone Variation on the Final Day of Oocyte Maturation. NCT03366025 | Fundacion Dexeus | — |
| Completed | Interaction of Melatonin and MTNR1B Genotype on Glucose Control - Study 1 NCT02642640 | Brigham and Women's Hospital | N/A |
| Completed | Influence of Caffeine Consumption on the Human Circadian System NCT05409339 | Psychiatric Hospital of the University of Basel | N/A |
| Completed | Effects of Light and Exercise on Human Circadian Rhythms and Performance NCT02747719 | Brigham and Women's Hospital | N/A |
| Completed | The Circadian Rhythm of Copeptin NCT02604875 | University Hospital, Basel, Switzerland | — |
| Completed | Aspirin AM or PM: Effect on Circadian Rhythm of Platelet Reactivity NCT01900639 | Leiden University Medical Center | Phase 4 |
| Unknown | Study of Circadian Clock Properties in Healthy Subjects, Obese and Type 2 Diabetic Patients. NCT02384148 | University Hospital, Geneva | — |
| Completed | Actigraphic Measurement of a Neurosurgical Procedure NCT00945230 | Child Psychopharmacology Institute | N/A |
| Completed | Examining the Biological Factors That Affect Sleep Duration NCT00607204 | Brigham and Women's Hospital | — |
| Completed | Effects of Different Colors of Light on Human Physiology NCT00200863 | Brigham and Women's Hospital | N/A |
| Completed | Impact of Sleep Disruption on the Menstrual Cycle NCT00456222 | Brigham and Women's Hospital | — |
| Completed | Circadian Variations in Ocular Blood Flow in Glaucomatous and Normal Eyes NCT00707226 | Medical University of Vienna | — |
| Completed | Effects of Sex Hormones on Circadian Rhythm in Men and Women NCT00001285 | National Institute of Mental Health (NIMH) | — |