Researchers at the University of Texas at Austin have built a skin-mounted patch that nudges the brain into deeper, longer stretches of REM sleep using pulses of ultrasound rather than drugs. In a study of 28 participants published in Nature Communications, the device — named NEUSLeeP — cut the time it took wearers to reach REM sleep by an average of 43 minutes and extended time spent in that stage by about 16 minutes, according to UT Austin.
The patch combines low-intensity ultrasound stimulation with electrodes that monitor brain activity in real time, letting it target deep brain regions involved in REM sleep noninvasively while tracking how the brain responds. Beyond faster, longer REM cycles, participants who wore the device also showed improved heart rate variability — a marker of the body's capacity to handle stress — and changes in brain circuits tied to emotional regulation, according to coverage in ScienceDaily.
This is the first time we've been able to noninvasively target deep brain regions involved in REM sleep, while simultaneously monitoring brain activity.
Kai Wing Tang, lead researcher
REM sleep is the stage most associated with dreaming, memory consolidation and emotional processing, and disruptions to it have been linked to conditions including depression, PTSD and chronic insomnia. Co-author Gregory Fonzo said the goal was addressing that link directly, noting that REM sleep "is not just about dreaming — it's about emotional reset and stress adaptation."
NEUSLeeP remains a research prototype, not a commercial product. The university's technology-transfer unit is pursuing a patent and exploring paths to market, and the research team says it now plans larger clinical trials to confirm the initial findings before testing whether the patch can help patients with PTSD, depression or chronic insomnia specifically — conditions where fragmented or insufficient REM sleep is common.
If those larger trials pan out, the approach could offer an alternative to sleep medications, which often suppress REM sleep even as they help people fall asleep faster — a trade-off researchers say has long frustrated sleep medicine.