Yes—sounds timed by a wireless headband strengthened slow brain waves in a one-night study of healthy people. These waves are a key feature of Deep Sleep (Slow-Wave Sleep). The 2026 study tested a headband with sensors on the forehead. It tracked brain waves and timed sounds to a chosen point in each wave. During the night, researchers alternated sound periods with comparison periods without stimulation. A full sleep-lab recording ran alongside the headband to check its results. The headband consistently delivered sounds near the intended point in the wave. This worked despite its weaker, less clear signals than the lab equipment. Sounds boosted slow-wave activity right away. The researchers also found lasting increases in wave frequency and strength during the tested periods. Brain-wave strength increased in the range of 0.75–5 cycles per second. Both recording systems picked up these changes. Stronger brain waves do not automatically mean more minutes asleep or better mornings. The source gives no percentage increase or number of extra minutes in this sleep stage. It also does not report better next-day energy or long-term benefits. This was an early test of whether the headband approach could work. It lays groundwork for future home use, rather than proving benefits at home. For BioSocial members, the useful distinction is what a device actually measures. A sleep-stage estimate and a brain-wave recording answer different questions. When comparing your own numbers with the community, include the device used. Notes on how rested you felt can add context without proving cause and effect. If you have tried sound-based sleep tools, what changed in your tracked numbers and how rested you felt?