Hi! Here is my first app!
This simple but useful app allows you configure the system to enable and/or disable all sounds of your android device at specific time.
You can configure it to automatically disable all sounds before your sleep time, and reenable it when you want. Easy, this is it.
‘Sleep Tight’ app icon
You can download for free from Google Play.
Android Revenge 
I love this app, but did not love my Android phone. I have recently purchased an iphone, and have no way to do exactly this – block all notifications but calls. Do you have any plans to develop an iphone app?