Sixteen....again?

I have amazing children, butI am in the midst of a few years that I dread. Having a 16 year old in the house. Having been through this twice before should have given me a clue. Not wanting to sit in the same room as us, speaking in one word sentences, no hugs...you know all the classic signs. Why are they like this? It is amazing to me how one day they are you loving child eager to hug you, say "I love you", sit next to you and cuddle. Then suddenly, it seems like overnight, they don't want any of that. They think they know everything and you cannot tell them otherwise. "Why do you have to know where I'm going? Hello, I AM YOUR MOTHER and I love you!. The good news it that amazingly, one day (in what seems like overnight) they come back to you. Wanting to be in the same room, speaking in complex sentences, hugging you, and best of all...."I love you too." As much as I don't like this stage in life, I can look forward to that some day in the near future.