Alarm when someone texts?

Hello. Is there a way for me to create an alarm that is triggered when I receive a particular message from IMessage on my iPhone from a particular contact? I want to be able to answer my girlfriend's texts at night, so I need something to wake me up if I am asleep.

I am somewhat of a heavy sleeper and the simple message tone won't wake me up at night. But I don't want that alarm ringing every time she sends me a message. Only when she does it at night… Any ideas?