My K/D just about doubles when I'm online after having a few (too many sometimes) drinks.
As for avoiding the hangover, the trick is to drink a lot of water before going to bed. Start drinking as much water as you can hold about at least an hour before going to bed (or passing out). If you wake up before a full night's (day's?) sleep, get up, relieve yourself, drink another few glasses of water, and go back to bed. Tylenol optional. You'll wake up feeling at worst tired. Been there, done that, didn't like it, got medical advice that works every time

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eagl <squealing Pigs> BYA
Oink Oink To War!!!