Reading Daily Caller they are discussing tweets that went off the charts about Hillary head nodding while Trump was calling her a liar.
One tweet suggested this explains why she is always looking downward.
My kiddo and I were messaging during the “debate” and a lot of it was about her rapid blinking, head nodding, frozen face, and how at one point, she began to stiffen up. I guess that a LOT of others noticed it all too.