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.
- Using Cannabis to Treat Restless Legs Syndromeon August 13, 2025 at 4:00 am
Conditions: Restless Leg Syndrome (RLS) Interventions: Drug: Cannabis oil; Drug: Cannabis placebo Sponsors: Sunnybrook Health Sciences Centre; University Health Network, Toronto Recruiting
- Restorative Early Sleep Treatment After the Emergency Departmenton August 13, 2025 at 4:00 am
Conditions: Insomnia; Nightmares Associated With Trauma and Stress; Nightmares; PTSD - Post Traumatic Stress Disorder Interventions: Behavioral: Cognitive Behavioral Therapy for Insomnia; Behavioral: Cognitive Behavioral Therapy for Insomnia and Nightmares; Behavioral: Sleep Education; Behavioral: Sleep Education enhanced with Nightmare Education Sponsors: Henry Ford Health System; American Academy of Sleep Medicine Recruiting
- Effect of CPAP on Blood Pressure in Excessively Sleepy Obstructive Sleep Apnea Subtypeon August 13, 2025 at 4:00 am
Conditions: Obstructive Sleep Apnea Interventions: Device: CPAP therapy Sponsors: Ohio State University; University of Pennsylvania Recruiting
- DISE: Phenotyping Obstruction Patternson August 13, 2025 at 4:00 am
Conditions: Obstructive Sleep Apnea Interventions: Other: Pharyngeal Manometry; Other: Submental Ultrasound Sponsors: University of Pennsylvania Recruiting
- Telerehabilitation Program Bases Aerobic and Baduanjin Exercises in Post Stroke Elderly Patientson August 13, 2025 at 4:00 am
Conditions: Stroke Interventions: Other: Telerehabilitation program bases aerobic and Baduanjin exercises; Other: Telerehabilitation program bases aerobic exercises Sponsors: Cairo University Recruiting
- The Effect of Nocturnal Dexmedetomidine on Postoperative Sleep Quality and Fatigue After Major Surgery in Elderly Patients: DEXSLEEP Studyon August 13, 2025 at 4:00 am
Conditions: Postoperative Fatigue; Postoperative Sleep Disturbances; Surgical Stress Response Interventions: Drug: Placebo; Drug: Dexmedetomidine Sponsors: Ziekenhuis Oost-Limburg Recruiting
- EGR2 and NLRP3 Pathways in Obstructive Sleep Apnea-Related Cognitive and Mood Disorderson August 13, 2025 at 4:00 am
Conditions: Obstructive Sleep Apnea-Hypopnea Syndrome; Anxiety Disorders; Depressive Disorders Interventions: Procedure: EGR2/NLRP3 pathway activity; Procedure: fatty tissue Sponsors: Xinhua Hospital, Shanghai Jiao Tong University School of Medicine Recruiting
- Examining the Role of the Orexin System in Sleep and Stress in Persons With Opioid Use Disorderon August 12, 2025 at 4:00 am
Conditions: Sleep Disturbance; Opioid-use Disorder Interventions: Drug: Suvorexant; Drug: Placebos Sponsors: Johns Hopkins University; National Heart, Lung, and Blood Institute (NHLBI) Recruiting
- Electrophysiologic Sleep Phenotyping and Sleep-Dependent Neuro-maturation in Clinical and Healthy Pediatric Populationson August 12, 2025 at 4:00 am
Conditions: Healthy Children; Children With Neurodevelopmental Disorders; Children With Neuropsychiatric Disorders; Children With Behavioral Syndromes Sponsors: National Institute of Mental Health (NIMH) Recruiting
- Lifestyle and Physical Activity as Part Of Obstructive Sleep Apnea Treatmenton August 12, 2025 at 4:00 am
Conditions: Obstructive Sleep Apnea Interventions: Behavioral: Individually tailored lifestyle and physical activity intervention; Behavioral: Individually tailored lifestyle and physical activity intervention combined with enhanced behavioral support -intervention (EBS) Sponsors: Filha ry; University of Jyvaskyla; Organisation for Respiratory Health in Finland; Central Finland Hospital District Recruiting
- The Power Down Pilot Study: A Novel Bedtime Manipulation Protocolon August 12, 2025 at 4:00 am
Conditions: Autism; Sleep Disturbance Interventions: Behavioral: Power Down bedtime manipulation Sponsors: University of Pittsburgh Recruiting
- PAP for Children With DS and OSASon August 12, 2025 at 4:00 am
Conditions: Down Syndrome; Obstructive Sleep Apnea Interventions: Behavioral: Family-informed intervention; Behavioral: Standard Clinical Care Sponsors: University of Miami; National Institutes of Health (NIH); National Heart, Lung, and Blood Institute (NHLBI); Children's Hospital Medical Center, Cincinnati; University of Pennsylvania 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