Jungle rain is a real field recording of steady rain near Uxmal, the ancient Maya city in the Mexican state of Yucatán. It is in the public domain under CC0. Its source does not name the person who recorded it or say when, so we name neither; the link below goes to the original upload.
What you're hearing
Rain falling steadily, looped so it plays as long as you like. The loop is twenty to forty seconds long, chosen so that no single sound in it stands out each time it comes round. It is the heart of the Focus mix, with brown noise low underneath, and it sits well on its own or under a noise color if you'd rather build your own mix.
Where the sound comes from
Jungle rain. Recorded near Uxmal, Yucatán, Mexico. Public domain (CC0). Original recording on freesound.org
Listen safely
This is a sound, played back through whatever speaker or headphones you already own. It doesn't diagnose, measure, or promise anything about how you sleep, focus, or feel — it's just noise and a handful of real recordings, mixed the way you like them.
Keep the volume low enough that you'd still notice a smoke alarm, a phone ringing, or someone at the door. If you fall asleep in headphones, choose a volume and a pair you'd be comfortable wearing all night, and a session length that ends when you'd want the sound to stop.
If you use this near a baby, keep the speaker several feet from the crib, never inside or clipped to it, and keep the volume low — the same care you'd take with any sound machine in a nursery.
If your relationship with sound, or with sleep, feels difficult rather than simply restless, a doctor or audiologist is the right person to talk to. This is a mixer, not a clinician.