QuiteSleep is an Android application that controls which people can interrupt your sleep, or any other activity defined by start and end times. In addition to muting calls, it can send an SMS and email with predefined text to advise callers that you are sleeping or busy.
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The application was updated for Android 2.2 (Froyo). Now you can put QuiteSleep into an SD card. There are now four different ways to determine when to block incoming calls, including blocking all calls, blocking only blocked contacts, blocking unknown calls, and blocking unknown calls and blocked contacts. An incoming call now can be blocked either by silencing the ringtone or by hanging up on the call. Other features were improved and some bugs were fixed.