19+ calming sounds to help your child fall asleep. Categories include Nature (Rainy Window, Sleepy Waves, Night Forest), Cozy (Campfire, Kitty Purrs, Mama's Heartbeat), Musical (Music Box, Sleepy Piano, Angel Harp, Twinkle Star), and Fantasy (Spaceship Hum, Fairy Garden). Evidence-based sound design for infant and child sleep.