A lot of times we don't realize we are being loud as we are so accustomed to that particular working environment and probably talk louder than we need to. Please say something because I'm sure they didn't realize they were disturbing others and I know I would appreciate someone nicely telling us we are a little too loud. Most passengers want to sleep on redeyes but our internal clocks are wide awake, also enhanced with a lot of coffee resulting in lots of chatter. I'm sorry it prevented you from sleeping soundly, and I hope next time you will say something...and it will be met with courtesy from your f/as