I just couldn't keep up. I don't have the energy I had ten years ago when I first did NaNo. And, I don't think I have as many functioning brain cells as I did back then.
I tried getting up early to write before work. I managed that a few days, but my brain just wouldn't function that early. I tried writing at work, but then damn work would get in the way. I tried writing as soon as I got home from work, but again, my brain just wouldn't cooperate. After dealing with stupid people all day, my mind didn't want to deal with my stupid characters. And I found myself resenting having to write all weekend to catch up.
So, I quit.
But, on the bright side, I managed almost 20,000 words. Some of them are good, others are headed to the recycle bin. So, thanks NaNo for that.