In the famous words of Bette Davis.."Fasten your seatlbelts, it's gonna be a bumpy ride." I have 4 children on the other side of 12 and let me tell you that is a modern day miracle right there my friend. ALL of them went through some sort of possession when they hit that age & I woke up wondering where my sweet, compliant, well-behaved children disappeared to. These were worse than POD PEOPLE.
It's an awkward time for them, their bodies are going through all sorts of changes both physically and emotionally. Often they don't understand it themselves, why they feel crabby, irritable, crying a lot, small things send them rocketing to the moon...it can be scary for them as well. And they usually sleep more, or want to it seemed.
My advice is set some ground rules about what is and isn't acceptable. Let them know you understand how they feel but just the same, they aren't allowed to disrespect you & lay out for them what exactly that means to you...they also seem to lose a few brain cells along the way. LOL.
Most of mine went through this for roughly 2 years (oh Lord I just heard you faint) and then they were back to themselves. I had to use my filter, as my 18yodd would say, because let me tell you, they know where to push that button of mine that awakens the beast within and I could've let my tongue loose on them, but I didn't. And that's a good thing because words are very hard to get past and you don't want to say anything in your frustration that will come back to hurt them when it's all settled down. Choose your battles wisely.
Here is a link with some great tips on it: http://www.webmd.com/content/article/72/81674.htm
Good luck & know that this too shall pass...and with enough booze it'll be fun (teasing!).