Could a Wearable REM Sleep Patch Help You Sleep Better? What a Study of 28 People Found

The bottom line: In an early human study, the skin-attached ultrasound sleep patch NEUSLeeP increased REM sleep time and reduced the time it took participants to enter REM sleep. However, overall sleep efficiency and the number of nighttime awakenings did not improve significantly, and the study was small, with only 28 participants. Its findings should not be generalized as evidence of a treatment effect for insomnia in general. [1]

The study, published in Nature Communications in June 2026, included 28 people: 16 healthy adults and 12 with insomnia symptoms. The device combines skin-attached electrodes with a focused-ultrasound unit, recording sleep while delivering ultrasound stimulation to the subthalamic nucleus, a deep region of the brain. Data from two participants’ polysomnograms were excluded because of substantial signal noise, leaving 26 participants for the primary sleep analyses. [1]

What Is REM Sleep, and Why Examine It Separately?

REM stands for rapid eye movement, or “rapid eye movement sleep.” Sleep alternates between non-REM and REM stages. Each cycle lasts approximately 80–100 minutes and typically repeats four to six times per night. During REM sleep, brain activity becomes notably similar to that seen during wakefulness. [2]

The fact that REM is important does not mean that more is always better. Healthy sleep is assessed through the balance of several factors, including REM sleep, deep non-REM sleep, total sleep time, sleep efficiency, and the number of awakenings. An increase in a single sleep stage should therefore not be treated as synonymous with an overall improvement in sleep quality.

What Actually Improved in the Study?

On the night of ultrasound stimulation, the proportion of REM sleep increased by 4.6 percentage points, from an average of 16.3% to 20.9%, equivalent to about 15.9 additional minutes. Across all participants, REM latency—the time before entering REM sleep—fell from an average of 177 minutes to 134.7 minutes, a reduction of about 43 minutes. [1]

However, the healthy participants and the insomnia group did not respond in the same way. The reduction in REM latency was more pronounced in the healthy group, while the change was smaller in the insomnia group. Because these findings came from a small sample, they do not support saying that “people with insomnia enter REM sleep 43 minutes sooner.” [1]

Why Does It Matter That Sleep Efficiency Did Not Improve?

Sleep efficiency is the proportion of time spent asleep out of the time spent in bed. In this study, neither the healthy group nor the insomnia group showed a significant change in overall sleep efficiency before versus after ultrasound stimulation, and the number of awakenings also did not decrease significantly. In other words, REM measures changed, but the results did not show that participants “slept longer” or “woke less.” [1]

Can an Increase in Heart Rate Variability Be Taken as an Improvement in Stress?

The study also observed an increase in heart rate variability (HRV). HRV refers to changes in the intervals between heartbeats and is used to examine the state of the autonomic nervous system. However, HRV alone cannot establish that stress has decreased or mental health has improved. The primary aim of this study was not to test an effect on stress, but to examine whether the device could modulate sleep stages. [1]

Can This Sleep Patch Be Considered a Treatment Device Available for Purchase?

No. This is an early clinical study demonstrating the potential of a new wearable neuromodulation platform. The researchers also identified several limitations, including the single-blind design, an incompletely balanced stimulation order, the small sample, and insufficient information about how long the effects lasted. The findings should not be interpreted as support for using ultrasound brain-stimulation devices independently in everyday life. [1]

What Should You Do First to Improve Sleep Now?

Rather than waiting for a new device, a practical first step is to ensure enough total sleep time. The U.S. National Heart, Lung, and Blood Institute (NHLBI) generally recommends that adults get 7–9 hours of sleep per day. Basic habits should come first: keep bedtimes and wake times from varying widely between weekdays and weekends, and reduce bright light before bed, as well as late caffeine and excessive alcohol. [3]

If you have signs of a sleep disorder—such as snoring and apnea, uncomfortable sensations in the legs, or insomnia lasting for months—do not rely solely on wearable scores; a medical evaluation is needed. The same applies if you get enough sleep but experience marked daytime sleepiness.

Is More REM Sleep Better?

Not necessarily. REM is simply one stage of normal sleep. Healthy sleep should be assessed by looking at the balance between non-REM and REM sleep, total sleep time, sleep efficiency, and patterns of awakenings together.

If a Sleep App Says I Have Little REM Sleep, Is There a Problem?

Sleep-stage estimates from consumer wearables are best treated as a reference. Clinical sleep stages are assessed through polysomnography, which includes measurements such as brain waves, eye movements, and muscle activity. A single app reading that repeatedly shows low REM sleep cannot diagnose a disorder. [2]

If I Have Insomnia, Should I Wait for This Ultrasound Patch?

No. This study is not at a stage that changes recommendations for commercially available treatment. If insomnia persists over a long period, it is more appropriate to begin with sleep assessment and treatment supported by established evidence.

DERME VERDICT

The NEUSLeeP study offers an intriguing possibility: a skin-attached device could record sleep while noninvasively modulating specific brain circuits. But an improvement in REM measures in an early study of 28 people is not the same as concluding that people “sleep better overall.” For now, readers should prioritize getting enough sleep and maintaining a regular rhythm, while persistent insomnia or daytime sleepiness should be evaluated through an established medical care pathway.