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 so your morning diary is confirm-not-type, reads HRV, resting heart rate and respiratory rate to show trends alongside that night's entry, and reads your audiogram only to tune pink noise to your hearing. Drift never writes entries back to Apple Health, so it can't alter or corrupt your existing health data.
Audio stays on your iPhone. Snoring, coughing, sneezing, sleep talking, breathing and gasping are detected entirely on-device with Apple's Sound Analysis. Audio is never recorded and never leaves your iPhone. The event labels it produces — what, when, how long, how confident — do sync to your account, so you can see last night on any of your devices.
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.