I use a great program called Audio Control Lite, I've never had much luck separating the notification / ringtone volume even via the check mark in settings. So this application at 11pm at night turns off my notification sounds and turns them back up at 8am. I leave the ringer on because no body ever calls me.
I mute the notifcations because my phone is pretty vocal and i'm a VERY light sleeper
My phone always says "New Email, Facebook Notification, Shipping Update, Facebook chat message". Even if it didn't speak those things and just dinged, it would still wake me up.
In this poll we are going to assume you leave your alarm volume on.