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.
- Validation of Five Seasons Sleep Tracking Mat for the Diagnosis of Obstructive Sleep Apneaon April 3, 2025 at 4:00 am
Conditions: Obstructive Sleep Apnea (OSA) Interventions: Diagnostic Test: Five Seasons [5S] Sleep Tracking Mat Sponsors: Shanghai 6th People's Hospital; West China Hospital; Second Affiliated Hospital of Soochow University; Dalian Municipal Central Hospital; Third Hospital of Inner Mongolia Autonomous Region; Beijing HuiLongGuan Hospital Recruiting
- Dream2Heal: An Adaptive Stepped-care Intervention for Chinese Cancer Survivors With Mild-to-moderate Insomniaon April 3, 2025 at 4:00 am
Conditions: Neoplasm; Sleep Disturbance Interventions: Behavioral: iDream2Heal; Behavioral: Easy Exercise; Behavioral: Dream2Heal; Behavioral: iDream2Heal & Easy Exercise Sponsors: The University of Hong Kong Recruiting
- The Sweet Dreams Study - Accuracy of Sleep Trackers in Childrenon April 3, 2025 at 4:00 am
Conditions: Sleep Sponsors: Arkansas Children's Hospital Research Institute Recruiting
- UrbanHEAT: Health Behaviors, Outcomes, and Disparities in Individually Experienced Temperature Across an Urban Communityon April 3, 2025 at 4:00 am
Conditions: Temperature Sponsors: National Institute on Minority Health and Health Disparities (NIMHD); National Institute of Nursing Research (NINR) Recruiting
- Interest of Auriculotherapy in the Management of Chronic Insomniaon April 3, 2025 at 4:00 am
Conditions: Chronic Insomnia Interventions: Device: Cryo-Auriculotherapy; Device: Sham comparator Sponsors: Hopital Foch Recruiting
- Sleep-dependent Learning in Agingon April 3, 2025 at 4:00 am
Conditions: Sleep Interventions: Behavioral: Sleep Sponsors: University of Massachusetts, Amherst Recruiting
- Peanut Consumption on Cognitive, Weight, and Inflammationon April 3, 2025 at 4:00 am
Conditions: Cognitive Performance; Inflammation; Weight Change, Body; Adolescents Interventions: Other: Food (peanut) Sponsors: University of Barcelona; Gasol Foundation; Universitat Oberta de Catalunya; Institut d'Investigacions Biomèdiques August Pi i Sunyer Recruiting
- Sleep Treatment Education Program for Young Adult Cancer Survivors (STEP-YA)on April 3, 2025 at 4:00 am
Conditions: Insomnia; Insomnia Due to Medical Condition; Cancer Interventions: Behavioral: STEP-YA with Coaching; Behavioral: STEP-YA without Coaching Sponsors: Dana-Farber Cancer Institute; National Cancer Institute (NCI) Recruiting
- The Acute T-Rex (Timing of Resistance Exercise) Studyon April 3, 2025 at 4:00 am
Conditions: Diabetes Mellitus, Type 2; Insulin Resistance; Glucose Intolerance; Sleep Disturbance; Overweight or Obesity; Insulin Sensitivity Interventions: Behavioral: Resistance Exercise Timing Sponsors: University of Utah Recruiting
- Sleep Disordered Breathing and Multimorbidity: The Xiangya SDB Cohort Studyon April 3, 2025 at 4:00 am
Conditions: Sleep Disordered Breathing (SDB); Sleep Apnea; Cardiometabolic Diseases; Multimorbidity; Neurodegenerative Diseases Sponsors: Xiangya Hospital of Central South University Recruiting
- Acetazolamide in Central Sleep Apnea Patients Using Medication for Opioid Use Disorderon April 3, 2025 at 4:00 am
Conditions: Central Sleep Apnea Comorbid With Opioid Use Interventions: Drug: Acetazolamide; Drug: Placebo Sponsors: Sanjay R Patel; National Institute on Drug Abuse (NIDA) Recruiting
- The Impact of Technology in Obstructive Sleep Apnea Myofunctional Therapyon April 2, 2025 at 4:00 am
Conditions: Obstructive Sleep Apnea (OSA); Snoring; Sleep Quality Interventions: Other: Exercise Sponsors: Case Western Reserve University; American Association of Orthodontists Foundation 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