What is Sleep?
Although everyone needs to sleep to maintain their health, the question “what is sleep?” has proven surprisingly difficult. During the state of sleep, the brain exhibits profound changes.
It is now believed the function of sleep is to clear metabolic waste products from the pathways of the brain. This helps explain why healthy sleep must be sufficient in both duration and depth.

What Conditions Are Associated With Sleep?
The most common health condition associated with sleep is insomnia. Insomnia is difficulty falling asleep, staying asleep, or both. Sleep disturbances can be physiological in nature (for example, Restless Legs Syndrome) or psychological (for example, nightmares.)
Experts have estimated that about 25% of Americans develop some degree of insomnia in any given year. In 75% of cases, it passes without long-term damage to sleep habits.
Other common sleep disorders include:
- Snoring
- Sleep apnea, “pauses” in breathing often caused by soft tissue blockage in the airway
- Sleep hypoventilation, trouble breathing in sleep caused by respiratory muscle weakness
- Restless Legs Syndrome, which causes discomfort only alleviated by moving the legs
- Bruxism, the grinding of the teeth during sleep, which can damage the teeth and jaw
Sleep medicine experts also recognize several less common sleep disorders. These include things like narcolepsy, nightmares and night terrors, and Rapid Eye Movement Behavior Disorder.
Maintaining Sleep Health
Many chronic sleep conditions arise with no known cause. However, maintaining good sleep hygiene can help. Sleep hygiene refers to the whole collection of habits that affect sleep health.
In general, it is a good idea to develop a consistent bedtime and routine for “going to bed.” Discontinue the use of phones and other “screens” an hour before bed, since the blue light of these devices inhibits the brain’s natural response to reduced lighting at night.
Remember, many factors can contribute to sleep health issues:
- Certain medications, such as those used for high blood pressure and asthma
- Chronic pain disorders and other conditions that cause persistent discomfort
- Stress in your personal or work life and conditions like anxiety or depression
Each individual has a slight variance in sleep need. Likewise, the duration of sleep needed does change depending on life stage. However, it is important to know everyone needs about eight hours of nightly sleep to maintain mental and physical health.
Medical Research on Sleep
With the answers to key questions on “why do we sleep?” coming into view, sleep researchers are continuing to pursue clinical sleep studies looking for new sleep disorder treatments.
Sleep clinical care has undergone revolutionary changes in recent years thanks to imaging technology that precisely pinpoints sleep-related changes in the human brain at any age.
Current Clinical Trials on Sleep
This list includes all clinical trials on sleep recognized by ClinicalTrials.gov. To add sleep clinical trials to our list, contact us.
- Assessing Improvements in Mood and Sleep Trialon June 5, 2025 at 4:00 am
Conditions: Depression; Suicidality; Sleep Interventions: Other: Treatment As Usual; Behavioral: Active Condition; Behavioral: Active Comparator Sponsors: University of Pittsburgh; Emory University; University of California, Berkeley; University of California, Los Angeles; Augusta University; National Institutes of Health (NIH); National Institute of Mental Health (NIMH) Recruiting
- Suvorexant for Alcohol Use Disorder (AUD): Neural Mechanismson June 5, 2025 at 4:00 am
Conditions: Healthy Volunteers; Alcohol Use Disorder (AUD) Interventions: Drug: Placebo; Drug: Suvorexant Sponsors: National Institute on Alcohol Abuse and Alcoholism (NIAAA) Recruiting
- Optimization of Pediatric Tonsillectomy to IMprove AnaLgesiaon June 5, 2025 at 4:00 am
Conditions: Pain, Postoperative; Tonsillar Hypertrophy; Tonsillitis; Pediatric Sleep Apnea; Sleep-Disordered Breathing Interventions: Drug: Methadone; Drug: Fentanyl/Hydromorphone Sponsors: Duke University; National Institutes of Health (NIH) Recruiting
- NIMH Rhythms and Blues Study: A Prospective Natural History Study of Motor Activity, Mood States, and Bipolar Disorderon June 5, 2025 at 4:00 am
Conditions: Bipolar Disorder; Major Depression; Migraine Sponsors: National Institute of Mental Health (NIMH) Recruiting
- Home Initiation of Noninvasive Positive Pressure Ventilation in Children With Medical Complexityon June 5, 2025 at 4:00 am
Conditions: Sleep-Disordered Breathing Interventions: Other: Home Initiation of NiPPV Sponsors: The Hospital for Sick Children Recruiting
- Effect of ANNE One-Wellue Device Array Use on Staff Bedside Vital Sign Measurement Activityon June 5, 2025 at 4:00 am
Conditions: Vital Sign Evaluation; Vital Sign Monitoring; Sleep Quality; Provider Behavior; Patient Satisfaction Interventions: Device: Device Array Use; Device: Routine Vital Sign Measurement Sponsors: Northwestern University; University of Minnesota Medical School/University of Minnesota Foundation; Sibel Health Inc. Recruiting
- Digital CBT for Insomnia and Depressionon June 5, 2025 at 4:00 am
Conditions: Depression; Insomnia Interventions: Behavioral: Cognitive Behavioral Therapy for Insomnia; Behavioral: Cognitive Behavioral Therapy for Depression; Behavioral: Mood Monitoring Sponsors: University of Rochester; United States Department of Defense; University of South Florida; Harvard University; University of California, Irvine Recruiting
- Dose-finding Study Assessing the Efficacy, Safety, and Pharmacokinetics of Daridorexant in Subjects Aged 10 to < 18 Years With Insomnia Disorderon June 5, 2025 at 4:00 am
Conditions: Insomnia Interventions: Drug: Daridorexant 10 mg; Drug: Daridorexant 25 mg; Drug: Daridorexant 50 mg; Drug: Placebo Sponsors: Idorsia Pharmaceuticals Ltd. Recruiting
- Phase 2 - Rhythmic Light Therapy for Alzheimer's Disease Patientson June 5, 2025 at 4:00 am
Conditions: Mild Cognitive Impairment Interventions: Device: Circadian-Effective Light; Device: Rhythmic Light; Device: Placebo Light; Device: Placebo Rhythmic Light Sponsors: Icahn School of Medicine at Mount Sinai Recruiting
- UrbanHEAT: Health Behaviors, Outcomes, and Disparities in Individually Experienced Temperature Across an Urban Communityon June 5, 2025 at 4:00 am
Conditions: Temperature Sponsors: National Institute on Minority Health and Health Disparities (NIMHD); National Institute of Nursing Research (NINR) Recruiting
- Family Study of Affective and Anxiety Spectrum Disorderson June 5, 2025 at 4:00 am
Conditions: Mood Disorders; Sleep Disorders; Migraine Sponsors: National Institute of Mental Health (NIMH) Recruiting
- Effects of Acupressure Applied to Intensive Care Patients on Physiological Parameters, Pain, Sleep Quality, Anxiety and Perception of Nursing Presenceon June 4, 2025 at 4:00 am
Conditions: Acupressure; Intensive Care Unit; Anxiety; Nursing Presence; Sleep Quality; Physiological Parameters Interventions: Other: Acupressure; Other: pseudo acupressure Sponsors: Gazi University Recruiting
Why Are More Clinical Trials on Sleep Necessary?
There may be no single “cure for insomnia”, but clinical trials on sleep help doctors develop effective sleep disorder treatment protocols for the various situations where sleep is disturbed.
Ongoing sleep research continues to redefine what we know about each of these conditions. Insomnia treatments are just one of the new sleep clinical resources coming from this effort.
Conclusion
The majority of American adults experience sleep disturbances at some point in life. With that in mind, clinical trials on sleep truly affect everyone. Unfortunately, sleep disorders are under-diagnosed – and those who suffer often do not pursue treatment. Participating in clinical studies on sleep is one way to help ensure you, and others, will rest better.
Content Box
- https://www.sciencedaily.com/releases/2018/06/180605154114.htm
- https://www.sleephealthfoundation.org.au/pdfs/Insomnia.pdf
- https://www.hopkinsmedicine.org/health/wellness-and-prevention/the-future-of-sleep-studies
- https://www.sleepfoundation.org/insomnia/what-insomnia
- https://medlineplus.gov/sleepdisorders.html
- https://www.sleepfoundation.org/articles/sleep-hygiene