The catalog
258 sleep sounds, five categories.
Every track is either a curated high-quality field recording or DSP-generated to a specific psycho-acoustic target. Many are informed by published research; on every tile in the app we publish a one-line summary of what the evidence says and rate its strength on a four-tier scale.
Sleep
Pads, drones, singing bowls, heartbeat — onset to deep.
Nature
Rain, ocean, wind, forest — curated field recordings.
Frequencies
Pink noise phase-locked to slow waves, binaural beats, solfeggio.
Neurodivergent
Low-sensory, non-triggering soundscapes for ADHD, autism, misophonia.
Affirmations
30 curated + unlimited AI-generated — let go, accept, rest.
How we rate evidence
The four-tier scale.
Tier ratings appear on every track in the app, so you know how strong the claim is before you press play.
- ★★★ Strong
- Multiple RCTs or a meta-analysis backs the specific acoustic mechanism this track uses. Example: pink-noise bursts phase-locked to slow-wave EEG (Papalambros 2017).
- ★★ Moderate
- Several smaller studies or a single high-quality RCT support the mechanism. Example: nature sounds reducing nocturnal arousal frequency (Stanchina 2005).
- ★ Low
- Pilot data or a single small study. Promising but not yet replicated.
- Traditional
- Long-standing cultural or contemplative practice (singing bowls, chants) with no clinical-trial backing yet — kept because listeners report subjective benefit. Marked transparently.
Three citations the catalog leans on
From the research file.
Pink-noise bursts phase-locked to slow oscillations enhanced slow-wave activity and overnight memory consolidation in older adults.
Papalambros NA et al. Frontiers in Human Neuroscience 11:109. ↗Systematic review (k=12 RCTs) of self-affirmation interventions reports consistent small-to-moderate improvements in subjective sleep quality.
Hall TA et al. Behavioural Sleep Medicine, 22(4). ↗Computational model demonstrates how acoustic envelopes that match slow-oscillation rhythm enhance the K-complex–spindle cascade central to NREM-3.
Wen Y et al. Journal of Theoretical Biology 506:110428. ↗Hear the catalog yourself.
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