I don't want to hear notifications about email while I sleep, because emails come at all hours. But I want to be able to still hear notifications about text messages. Everything I've seen has emails and txts tied together as far as sound goes. can they be separated? I still want to get silent notifications and the green flashing light, but no noise for emails. I would even be good with no noise for emails ever, just the green flashing light/notification symbol on screen.