Why rain
Rain sounds for sleep
Why rain on glass is the most-played sleep sound, what the research actually says, and how loud to keep it.
What people are actually doing
The videos that win this niche are eight hours of rain on a window and almost no UI. Calm’s rainstorm video has been a top Google result for “sleep sounds” for years. The job is masking: a steady wash so a door, a truck, or a thought does not register as new.
What rain is, acoustically
Rain sits between pink and brown. Close drops on glass are brighter (higher band). Distant wash is low. That is why a single looped sample often feels fake — it has one distance. Murmur’s rain is stereo close drops plus a room wash, not a licensed 12-second pack.
What the evidence supports
Continuous, predictable sound can mask unpredictable noise and shorten the time it takes some people to fall asleep. Sleep Foundation notes pink-like nature sounds (rain, wind, ocean) as the familiar examples. That is masking, not a drug. It does not treat insomnia, apnea, or depression.
What it does not do
A 2020 review of 38 studies found limited evidence that continuous noise improves sleep overall, and some protocols delayed sleep. In 2026, lab work associated all-night broadband noise around 50 dB with less REM. So: moderate volume, and if you wake groggy, try a timer that fades before dawn.
By JTT · byjtt.com · hello@byjtt.com