Tiredness can make tics worse. Tics can be made worse indirectly due to stress from fatigue and increased caffeine consumption.
Fatigue can lead to many issues, such as sore or aching muscles, moodiness and irritability.
Tics can be triggered by sore muscles and aching joints, this can increase discomfort leading to increased tics.
Irritability often leads to an increase in tics, with sensory issues documented by many people within the Tourette and tic disorder community.
The same can be said for anger and stress levels.
It seems that the symptoms of tiredness can trigger tics, creating a vicious cycle of tiredness > tic increase > tiredness.