Drift is a private sleep journal that teaches the CBT-I techniques clinicians use — a guided plan you follow yourself. Log a 60-second morning diary, watch your sleep efficiency against an honest 85% goal line, and follow a weekly sleep-window plan built from your own entries.
A plan, not just a chart. Each week Drift reviews your diary and suggests how your in-bed window could change, using the published sleep-restriction titration rules (AASM clinical practice guideline, Edinger 2021) with a hard 6-hour minimum window. Every suggestion shows its reasoning — nothing is a black box, and you stay in control.
No fake sleep score. Drift shows your real sleep efficiency — time asleep over time in bed — against the 85% goal used in the published literature. No proprietary composite number, no gamified grade.
Built for real schedules. A shift-work track for rotating rosters, a perimenopause track that doesn't penalise vasomotor wake-ups, and a pain-aware track with a gentler floor. The diary accepts any sleep and wake time, including cross-noon schedules.
Reads Apple Health, never writes to it. With your permission, Drift reads sleep stages, HRV, resting heart rate, and respiratory rate so your morning diary is confirm-not-type. Drift never writes entries back to Apple Health, so it can't alter or corrupt your existing health data.
Audio stays on your iPhone. Snore, cough and sleep-talk detection runs entirely on-device with Apple's Sound Analysis. Only event labels sync — never a second of audio.
The free tier genuinely works: the morning diary, your sleep-efficiency trend, stimulus-control education, and your first computed sleep window with your first weekly review. Drift Pro — $9.99/month or $59.99/year with a 7-day free trial on the annual plan — continues the weekly reviews and adds the coach, on-device sound analysis, audiogram-tuned pink noise, and sleep stories. Auto-renews until cancelled; cancel anytime in your App Store subscription settings, and Restore / Manage Subscription both live inside the app.