Why does my head jerk when I'm really tired? Is it a spasm/tic?

Question

It happens a lot in public (It's just one sharp jerk like I'm shaking it form side to side, or my head occasionally whips to one side as turning, to go back to normal position). I don't mind if it's in private, but in pubilc it's embarrassing (Then again, everybody on my course thinks I'm a weirdo anyway....)

Explanations and suggestions would be helpful.

Just out of curiosity, shasta604, how would it be related to lactic acid buildup?

Answer 1

lactic acid buildup.eat banannas before bed.