Optimized user experience by leveraging iOS frameworks, resulting in seamless integration of key features and enhanced app performance. Human composed, algorithmically remixed sounds to optimize getting you to sleep, keeping you asleep, and waking you up feeling refreshed. Over 100 billion sequences to experience Control the soothing voiceover separately from the music (change the gender, volume, or 3D effect). The narrations, which automatically change each time you use them, are based on proven clinical sleep interventions.