✨ Local-first Intelligence

When Did I Sleep?

Track and review your sleep schedule automatically with on-device motion detection. Complete privacy, zero account requirements, and no remote servers logging your life.

Download on the App Store
When Did I Sleep PRO
7.8h
Quality
Excellent Sleep
Optimal bedtime & wake timings
Went to Sleep
22:45
Woke Up
06:33
Observing Device Activity

Core Principles

Carefully designed to be lightweight, offline, and reliable.

Auto Observation

No buttons to manually toggle. The app leverages iOS motion and fitness data algorithms to determine your exact sleep entry and rise times.

🔒

100% On-Device

We don't collect data because we don't have servers. All sleep data is saved in your local sandboxed database on your iPhone.

☁️

iCloud Sync

Optionally secure your logs. Sync safely across your iPad and iPhone utilizing Apple's encrypted private CloudKit container.

📊

No Traps or Accounts

Zero login registration flow. Skip the passwords, advertisement pop-ups, tracking scripts, and constant analytics.

Sleep Quality Estimator

Slide to adjust went-to-bed and woke-up timings to simulate how our app rates sleep quality.

Excellent

Sleeping between 21:00 and 23:00 leads to optimal rest and circadian alignment.

Frequently Asked Questions

How does the app detect my sleep without a watch?

It uses your iPhone's Apple CoreMotion framework, which monitors device activity, steps, and system interactions to construct when you last put down and first picked up your phone.

Will this run down my battery?

Not at all. The app queries system logs accumulated by the iOS hardware subsystem. It does not run high-energy background GPS tracking or poll active sensors continuously.

Where can I export my data?

You can instantly export all raw sleep history and duration values as a spreadsheet (CSV format) directly in Settings -> Export CSV.