Sleep Cycle is a personal sleep tracking app that uses sound analysis technology to monitor and analyze sleep throughout the night. Drawing on over 15 years of sleep science and more than 3 billion recorded sleep sessions, the app provides users with accurate, data-driven insights into their sleep quality and patterns.

The Sleep Score feature evaluates each night by measuring total sleep duration, time spent in different sleep stages, and the frequency of nighttime interruptions. Sleep Stages analysis breaks down periods of light, deep, and dream sleep to help users understand how each cycle contributes to physical and mental recovery.

Smart Alarm goes beyond standard alarm clocks by detecting the lightest sleep phase within a user-defined wake-up window and triggering at the optimal moment for a smooth, refreshing start to the day. A library of Sleep Sounds allows users to replay nighttime audio recordings to explore what happened during their rest in an engaging and personalized way.

Sleep Aid provides a guided audio journey into restful sleep through curated content including sounds, stories, and meditations, all set to fade softly so users can drift off undisturbed. Science-based guidance on Healthy Sleep Habits covers consistent sleep schedules, calming bedtime routines, and bedroom environment optimization to support lasting improvement.

A free series of online Sleep Classes developed with Dr. Mike Gradisar, a world-renowned sleep researcher with 25 years of expertise, addresses sleep challenges across all life stages from teenagers to parents to adults managing midlife changes. Sleep Cycle holds a 4.6 rating on the App Store and a 4.5 rating on Google Play.