Sleep as Android

The Alarm Clock That Actually Studies Your Sleep Patterns

I’ve been testing sleep tracking apps for nearly a decade, and most of them fall into one of two camps: overly simplistic timers that just log your bedtime, or overly complex medical-grade tools that require a PhD to interpret. Sleep as Android, developed by the Urbandroid Team, manages to sit squarely in the sweet spot between these extremes. It’s an alarm clock that does far more than just wake you up—it actively analyzes your sleep quality, adjusts its behavior based on your sleep cycles, and offers a surprisingly deep set of tools for improving how you rest.

The core mechanic is straightforward: instead of a jarring, fixed-volume alarm, this app starts its wake-up signal at a low, gentle volume and gradually increases it over a configurable period. This mimics natural waking patterns and reduces the stress of sudden loud noises. But the real value lies in what happens before you even set the alarm.

Core Features That Go Beyond a Basic Alarm

The app’s sleep tracking engine is where it differentiates itself from standard clock apps. It uses your device’s sensors—accelerometer and microphone—to monitor your movement and ambient sound throughout the night. This data is then processed to generate a detailed sleep graph that breaks down your sleep into deep, light, and REM phases. You can view this data over days, weeks, or months, giving you a clear picture of your sleep trends.

One of the most practical features is the "smart wake-up" window. You set a time range (e.g., 7:00 AM to 7:30 AM), and the alarm will trigger during your lightest sleep phase within that window. This means you wake up feeling more refreshed because you’re not being yanked out of a deep sleep cycle. The app also compares your actual sleep duration against recommended norms (based on your age and activity level) and provides actionable suggestions for adjusting your habits.

For users who struggle with falling asleep, the app includes a library of lullabies and ambient sounds. These tracks are set to automatically fade out after a user-defined period, preventing them from playing all night and disrupting your sleep architecture. The lullabies are not just generic white noise—they’re specifically designed to encourage slower brainwave activity.

Security and Novelty Features

Beyond the sleep science, Sleep as Android includes a set of "unlock challenges" that force you to actually wake up before you can silence the alarm. The most popular option requires you to solve a mathematical equation—basic arithmetic that becomes surprisingly difficult when you’re half-asleep. Other options include scanning a QR code placed in another room, shaking your phone a set number of times, or walking a certain number of steps. These features are designed to prevent the common problem of hitting snooze and falling back into a deep sleep.

Another practical tool is the "nap detection" mode, which automatically logs short sleep sessions (under 90 minutes) and adjusts your sleep debt calculations accordingly. The app also integrates with third-party wearables like the Pebble Watch and certain fitness trackers, allowing for more precise motion detection without needing to keep your phone on the mattress.

• Sleep cycle graph with deep/light/REM phases
• Smart wake-up during light sleep window
• Math equation unlock for alarm
• Automated lullabies with fade-out timer

Download for Better Sleep Management

Limited offer: Get the full sleep tracking suite with no third-party ads. Today only, unlock the Turbo subscription with exclusive access to advanced sleep statistics and personalized habit recommendations.

Heads up: you’ll need wifi or mobile data for initial setup and for syncing sleep graphs to the cloud. Some advanced features, like the wearable integration and detailed trend analysis, require the paid Turbo subscription. The core alarm and basic sleep tracking work offline.