How can I exclude certain contacts from silent mode? During the night, I set my phone to silent, since even the vibrate wakes me up. Is there some way to let it still vibrate if I get a call from certain contacts?
Silent Mode Bypass can do what you want.


  Silent Mode Bypass automatically disables Silent/Vibration mode when receiving calls from selected contacts.
  
  Mostly useful at night if you know you can receive important or emergency calls from certain contacts, but want to keep everything else—texts, emails, notifications—silenced.