that's a common reaction to alcohol. Also, the table-top dancing effect. It's basically because alcohol not only depresses the central nervous system making your reactions slower (which is why beer+car=bad) it also depresses neural action that is responsible for mood and impulse control and will basically let the dominant emotion of the time shine through with no checks. So if you feel grumpy, God help your companions, and if you feel sexy, God help the cute guy behind the bar!
Not sure why it would keep you up all night. I assume you stop drinking when you get grumpy since if you keep drinking enough your body can't help but succumb to the depressant - it falls down and goes unconscious! It could be that it lessens control of your thought processes so you can't get to sleep around your "brain traffic", or perhaps, a loss of social regulation makes you want to party party party till the break of dawn!
35kg lost. (November 2005 - October 2006)
15kg gained again (as at October 2010).
Back to the drawing board - Let's do this thing!
"You can't change the winds, but you can change the sails"
"Reach out and take control of what lands in your lap"