Sleep as Android (free - $3.00 for sleep tracking) is an app that helps users optimize sleep by tracking movement at night, hours of sleep, and waking them gently.
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Pro Monitors sounds during sleep
This app will notify users if they are snoring, talking in their sleep, or have sleep apnea.
Pro Sends a notification for sleep deficit
If a user isn't getting enough sleep, this app will send a notification and help them get back on track.
Pro Charts for optimal sleep duration and fall asleep hour
Provides solid suggestions for when to sleep in order to optimize ones sleep quality. It adapts to your sleep patterns over time and relies on ratings provided by the user as well as Deep Sleep % calculated by the app.
Pro Smart watch compatibility
This app is compatible with Pebble, Android Wear technology, and Tizen. And some of Garmin wearable devices as well.
Pro Gentle sounds for waking up and falling asleep
A set of nature sounds are included for falling asleep and waking up peacefully. If the sounds aren't enough to wake up, music can be played, or a puzzle alarm can be set.
Pro Anti-snore monitor
An alarm can be set to vibrate each time a snore occurs.
Pro Powerful alarms
Alarms with "smart period," 8 kinds of captcha, "backup alarm," etc.
Con Have to manually tell it when you go to sleep
This doesn't work as seamlessly as sleep trackers in wearables, like Fitbit trackers. It doesn't record your sleep time, you have input when you go to sleep and when you wake up, which makes it far less useful.
Con Requires outside file viewer to wake up to music
In order to choose a song on the SD card, a file viewer is required.