🌊 slow tide
Slow, quiet instrumental songs for settling a baby to sleep. Each one is written to rules drawn from published research, and each song's page shows which studies it relies on, each one free to read in full. They may help your baby settle; nothing here is a treatment.
- Put the speaker at least 2 metres from the crib. Never in it or on it.
- Keep the volume low: at the baby's ear it should be quieter than a calm conversation (under about 50 dB; a phone sound-meter app will tell you). Set it once, with the loudest song.
- Use the sleep timer instead of playing all night. It fades out over a minute.
Why: the published ceiling for a newborn's sound environment is 45 dB (McCallig et al. 2024); white noise at 55 dB measurably reaches the sleeping infant brain (Li et al. 2025); and the review of white noise in newborn care asks parents to limit volume and duration (Öz and Demirci 2025). Every study behind these songs is open access, listed under each song and in the research notes.
Songs
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How the songs are made
An agent surveys the literature on infant sleep and infant-directed song, keeps the findings in RESEARCH.md, distils them into numbered rules in COMPOSITION_RULES.md, and writes each song in strudel against those rules. A checker script rejects a song that breaks a rule or cites a study that is not in the notes, and the lab measures the audio for clicks, clipping and level.