Different alcohols make you act differently
Don't give Dave tequila: he'll challenge everyone in the room to a dance-off. Don't let Becky have whiskey: she'll bite someone's ear off. Many people claim to have "their drinks" that make them act certain ways.
Science would say there's only one drink (alcohol) that makes you act one way (intoxicated). Your resulting behavior/attitude is no more than a placebo effect created out of your own expectations and experiences. If you used to have whiskey with your dad during rounds of golf, you probably associate it with good times (unless your dad's an asshole). If you used tequila in college to get the party started, you probably expect it to be the party catalyst. Expectations are a powerful force, so you can easily make yourself feel a certain way with certain drinks. But it has nothing to do with the drink itself.
One drink per hour will keep you sober
If everyone were the same gender, size, and age, this would be a fantastic rule of thumb. But because these and a dozen other factors determine our BAC, it has no basis in reality. If your 4'11", 100lb, 48-year-old, hungry, diabetic, alcohol-sensitive aunt just had a tequila shot, it’ll probably be a couple hours before she's back to even. Andre the Giant, on the other hand, could probably take a few more hits.
Nightcaps will help you sleep
Contrary to long-held beliefs, alcohol is more than just a sedative. Modern science has unveiled the stimulating effects of booze to be just as strong, if not slightly stronger, than the sedative effects. The worst of these stimulations is the one that screws with your sleep.
While you may fall asleep faster, alcohol prevents your brain from falling into restorative REM sleep, which goes a long way toward making you feel truly rested. The lack of deep sleep weakens your immunity, slowly kills you, and turns you into an asshole.