In my layperson's opinion, any change in twitching due to cold or flu signals a possible association with antibodies. If twitching increases, it could be that the immune system is activated to produce more bad guys to our nerves. If it decreases, it could be that our immune system is busy producing different antibodies to attack the virus rather than the ones that impact our nerves or the new antibodies are just outnumbering the bad and blocking them from attacking. Just some thoughts.