Adaptive Sound Technologies has been refining sound machines for over a decade. The Sound+Sleep SE stands out because of its Adaptive Sound technology, which uses a built-in microphone to listen to your room and automatically adjust the volume of the white noise. If a truck rumbles by or a dog barks next door, the unit responds by raising the masking sound slightly, so you stay asleep. It is a genuinely useful feature that makes the device feel smarter than the average sleep machine.

The sound library is deep. You get 64 total tracks across 16 categories, from standard white, pink, and brown noise to more specific options like City, Baby, and Rides. Each category has four richness levels (think of them as EQ presets), so you can tweak the Ocean track from a gentle lapping to a heavier surf. The audio comes through a 3.5mm jack if you want to pipe it through better speakers, though the internal driver is loud enough for a large bedroom. The unit is corded, so you will need a nearby outlet, but you never have to worry about battery life.

The build is simple plastic with a white and silver finish. It is not a design statement, but it is unobtrusive on a nightstand. The main trade-off is that the Adaptive Sound feature works best with consistent ambient noise. It can struggle with sudden, sharp sounds like a door slam, as the adjustment takes a second. For steady drone noise like traffic or a snoring partner, it is excellent.