You can see the noise striping the waterfall as he turns it on and off. But the noise from the light is small potatoes compared to some other common household items, like those power line adapters ...

WHITE NOISE This contains all frequencies in equal measure that sound like a heavy waterfall or high fan to help get a nice, solid sleep. PINK NOISE Pink noise, like ocean waves or steady rain ...

Here's what experts think about the sound and its potential benefits for people who have insomnia or sleep troubles.