Quite Sleep APK

QuiteSleep is an application for Android 2.0+ which manages your incoming calls
when you're busy, sleeping, or doing anything between two time slots in any day
of the week. QuiteSleep can block a list of callers or even other different
incoming calls and send an SMS or e-mail with a predefined text to notify you're
busy, sleeping, etc.

Four different ways to allow who can call you:

1) block all; 2) block only blocked contacts; 3) block unknown 4) block unknown
and blocked contacts