| Recruiting | Mind After Midnight NCT07438912 | University of Arizona | N/A |
| Recruiting | Effects of Akkermansia Muciniphila and Berberine Supplementation on Insulin Sensitivity in Night-shift Workers NCT07440147 | FH Joanneum Gesellschaft mbH | N/A |
| Not Yet Recruiting | Chronotherapeutic Optimization of Teriparatide Administration in Postmenopausal Osteoporosis NCT06951776 | Peking University Third Hospital | N/A |
| Recruiting | Translation and Validation of the French Version of the Sleep Regularity Questionnaire: a New Tool to Address NCT06727448 | University Hospital, Bordeaux | — |
| Completed | Investigating the Relationship Between Glycemia and Sleep in Adults With Cystic Fibrosis-Related Diabetes NCT06700889 | Massachusetts General Hospital | — |
| Completed | Older Adults Exercising On Time NCT06613958 | Leiden University Medical Center | N/A |
| Recruiting | Night Shift Work and Biomarkers of Obesity Risk in Hospital and Industry Workers NCT06288568 | University of Vienna | — |
| Unknown | Prevalence and Affecting Factors of Sleep and Circadian Rhythm Disorders in ICU NCT06346613 | Shanghai Zhongshan Hospital | — |
| Completed | Melatonin Agonist for Shift-time Workers. NCT07382843 | Tri-Service General Hospital | Phase 4 |
| Unknown | The Effect of Sequential Feeding for Circadian Rhythm and Gut Flora Rhythm in Critically Ill Patients NCT06083831 | Qingdao University | — |
| Completed | A Feasibility Trial for Circadian Rest-activity Rhythm Disorders in Cancer (RALI) NCT06329479 | University of Dublin, Trinity College | N/A |
| Completed | Identifying Circadian Rest-Activity Rhythm Disorders in Patients With Advanced Cancer NCT06023654 | University of Dublin, Trinity College | — |
| Completed | Implementing and Sustaining a Sleep Treatment to Improve Community Mental Health Part 3: Sustainment NCT05956678 | University of California, Berkeley | N/A |
| Completed | Self-Care for Dementia Caregivers NCT05309577 | University of Pittsburgh | N/A |
| Unknown | An Observational Clinical Study on the Intestinal Flora in Circadian Rhythm Disorder and Healthy Controls NCT05694481 | Third Military Medical University | — |
| Unknown | PBM Effects on Health and Well-being in Humans NCT05619133 | Seaborough Life Science B.V. | N/A |
| Unknown | Melatonin and Vaccine Response, Immunity, and Chronobiology Study NCT04953754 | Walter Reed National Military Medical Center | N/A |
| Unknown | SHIFTPLAN: an RCT Investigating the Effect of a Shift Work Intervention on Fatigue, Sleep and Health. NCT05452096 | University Hospital, Antwerp | N/A |
| Unknown | Sleep, Obesity and Mental Disease - Biological Markers for the Evaluation of Circadian Rhythmicity NCT05413486 | Esbjerg Hospital - University Hospital of Southern Denmark | — |
| Unknown | Ganglion Cell Thickness in Enuresis Nocturna NCT05126732 | Izmir Bakircay University | — |
| Completed | Validation of Circadian Biomarkers in Patients With Sleep Disorders NCT04690504 | Brigham and Women's Hospital | — |
| Recruiting | Effects of Blocking Blue Light At Night Post CABG, AVR, MVR, CABG AVR, CABG MVR, or SAH NCT04578249 | West Virginia University | N/A |
| Recruiting | Light Therapy in Parkinson's Disease NCT06129942 | Second Affiliated Hospital of Soochow University | N/A |
| Completed | Sleep Timing, Eating and Activity Measurement Study NCT04992611 | Children's Hospital Medical Center, Cincinnati | N/A |
| Completed | Light Therapy for Chronic Insomnia in General Practice NCT04612192 | University Hospital, Strasbourg, France | N/A |
| Completed | Multidisciplinary Expert System for the Assessment & Management of Complex Brain Disorders NCT05171725 | Neurological Institute of Athens | — |
| Completed | The Role of the Circadian System in Binge Eating Disorder NCT04724668 | University of Cincinnati | N/A |
| Unknown | Managing Sleep-wake Disruption Due to Hospitalisation: the Circadian Care Project NCT05228444 | University Hospital Padova | N/A |
| Unknown | The Disorder of Circadian Clock Gene and Early Cognitive Dysfunction After General Anesthesia NCT04421872 | Shengjing Hospital | N/A |
| Completed | The Role of Circadian Rhythms in Cancer-Related Symptoms NCT04401189 | Aarhus University Hospital | — |
| Completed | Daytime Bright Light, Circadian Abnormalities, and Delirium in Medical ICU Patients NCT03684460 | Yale University | N/A |
| Unknown | the Efficacy and Safety of Agomelatine in the Patients With Parkinson's Disease NCT03977441 | Second Affiliated Hospital of Soochow University | Phase 4 |
| Unknown | Functionality of Endogenous Biological Clock in Sepsis NCT04063332 | University of Athens | — |
| Completed | The Music, Sleep and Dementia Study NCT04157244 | University of Pennsylvania | N/A |
| Completed | Sleep and Circadian Intervention Program for Chronic Musculoskeletal Pain NCT03646084 | Consorcio Centro de Investigación Biomédica en Red (CIBER) | N/A |
| Completed | Evaluation of the Reliability and Validity of a Diagnostic Sleep Disorders Questionnaire NCT03468400 | Dayzz Live Well Ltd. | — |
| Completed | Systematic Light Exposure for Fatigue in Breast Cancer Patients NCT03217201 | Icahn School of Medicine at Mount Sinai | N/A |
| Completed | The Effects of Bright Light Exposure on ICU Nurses NCT03331822 | University of Pittsburgh | N/A |
| Terminated | A Study to Assess the Wakefulness Promoting Effect, Safety, Tolerability, and Pharmacokinetics (PK) of LML134 NCT03141086 | Novartis Pharmaceuticals | Phase 2 |
| Completed | Programmed Environmental Illumination (PEI) of Hospital Rooms to Prevent/Reduce Cancer-Related Fatigue NCT03198754 | Icahn School of Medicine at Mount Sinai | N/A |
| Completed | The Healthy Patterns Sleep Study NCT03682185 | University of Pennsylvania | Phase 3 |
| Completed | Identification of Novel Circadian Biomarkers NCT02291003 | Northwestern University | — |
| Completed | Association Between Light Spectrum and Survival After Cataract Surgery NCT04187157 | University of Pittsburgh | — |
| Completed | Circadian Disturbances After Breast Cancer Surgery NCT01171508 | Melissa Voigt Hansen | — |
| Completed | Light Sensitization Study NCT01327040 | Brigham and Women's Hospital | N/A |
| Completed | Human Circadian Sensitivity to Very Short Light Pulses NCT01330992 | Brigham and Women's Hospital | N/A |