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Our Research

Level Sleep has been active in sleep and sleep research for more than 15 years.

Level Sleep's first foray into sleep research began when we developed a resoundingly successful pillow, which was clinically tested by Dr. Clete Kushida, medical director of the Stanford Sleep Medicine Center, and director of the Stanford Center for Human Sleep Research. Encouraged by Stanford researchers, we went on to develop the TriSupport mattress. 

We invite you to learn more about our clinical studies below.

Restore Pillow Research

In a series of clinical trials conducted with 29 subjects with mild obstructive sleep apnea, a team of researchers at Stanford University Sleep Disorders Clinic and Research Center, led by Dr. Clete Kushida, found that use of a special pillow, now part of Level Sleep’s portfolio of sleep products, significantly reduced the frequency of sleep-disordered breathing.

Specifically, in an article published in Sleep Research Online titled “Cervical Positional Effects on Snoring and Apneas,” Kushida , Dement, et al. found the design behind Level Sleep’s Restore Pillow resulted in a:

  • 78% reduction in the number of snoring events

  • 86% reduction in duration of snoring events

  • 24% reduction in obstructive sleep apnea

The since updated and improved version of the Level Sleep Restore Pillow went on to gain FDA 510(k) clearance, having been clinically tested and shown to be helpful in reducing snoring.

Research On The TriSupport Design

Featured in all Level Sleep mattresses and toppers, TriSupport features three zones to support the curves and weights of the body with three unique sleep surfaces, including a lumbar zone that supports both back and side sleepers. We tested the mattress for its effectiveness in reducing pain, improving sleep and daytime function versus other mattress designs, many of which date back to the turn of the century.

Research Study Results:


In 2009, we commissioned a 30-person, Institutional Review Board (IRB) approved, single-blind sleep trial, again designed by Clete Kushida, M.D., PhD., in which study participants tested their current mattress against ours. The study was conducted by Cheri Mah, MS, Sleep Researcher, now at UCSF Human Performance Center. The results confirmed that the TriSupport concept was working—participants fell asleep more quickly, woke up with less pain and stiffness, and reported significantly more energy and sleep satisfaction on our mattress.

Mattress Study Methodology


Thirty healthy adult subjects (16 men, 14 women) between 25 and 64 years old were randomized into two groups (condition 1, condition 2), each consisting of 15 subjects. The men and women were categorized into three age brackets, 18-30 (4 men, 4 women), >30-45 (6 men, 6 women), >45 years (6 men, 4 women) of age, that were closely matched in both conditions. Fourteen individual subjects (8 men, 6 women) without bed partners and 16 subjects with bed partners (8 men, 8 women) were equally matched in both groups.

Objective data was collected via Braebon Medibyte and Actiwatch sensor devices.  Subjective data was collected through a series of established questionnaires including Morning Rating Scales, the Pittsburgh Sleep Quality Index (PSQI), and the Epworth Sleepiness Scale (ESS).

Full statistical analysis was done to ascertain statistical significance.

Mattress Study Results

Sleep Quality:

  • Sleep latency (Time required to fall asleep p-value: 0.001) 55.5% reduction (PSQI)  
  • Tossing and turning (p-value: <0.001) 34.5 % reduction (Morning Rating Scales)
  • Total body position transitions (p-value: 0.005) 17.2% reduction (Braebon Medibyte)  
  • Awakenings (p-value: 0.003) 30.0 % reduction (Morning Rating Scales)
  • Quality of sleep rating (p-value: <0.001) 24.5% increase (Sleep Journals)

Pain Reduction:

  • Pain reduction (9 out of 30 subjects reported they had some pain: p-value: 0.001) 57.1% reduction (Morning Rating Scales)
  • Stiffness (p-value: <0.001) 53.7% reduction (Morning Rating Scales)  

Daytime Function:

  • Day dysfunction due to sleepiness (p-value: <0.001) 62.5% reduction (PSQI)
  • Fatigue (p-value: <0.001) 43.2% reduction (Morning Rating Scales)
  • Sleep Satisfaction (p-value: <0.001) 60.4 % increase (Morning Rating Scales)   

Pressure Map Analysis Methodology

We placed a side-lying test subject on eight different mattress models: Four from a leading innerspring mattress brand, three from a leading memory foam brand, and a Level Sleep TriSupport mattress.

Using a XSENSOR® full body pressure mapping system, we mapped, imaged, and recorded the pressure readings of the subject on each mattress. The images are from one each of the different types of mattresses and have been chosen to demonstrate the results.


Pressure maps of TriSupport system vs. conventional mattress types

We recorded the peak reading of pressure for each mattress in millimeters of mercury (mmHg), a measure of pressure. The table identifies the peak pressure reading for each type of mattress, averaging the reading by type/brand of mattress.


Pressure comparison of TriSupport vs. other mattresses

Ready for Your Own At-Home Research?

Your home is the best lab for exploring whether Level Sleep products deliver the same benefits to you that hundreds of others have experienced. You'll have 110 nights to try our products as part of our "Better Sleep Guarantee"; if you're not thrilled with the results we'll provide you a full refund.