these are common warning signs of overtraining syndrome:
washed-out feeling, tired, drained, lack of energy
mild leg soreness, general aches, and pains
pain in muscles and joints
sudden drop in performance
insomnia
headaches
decreased immunity (increased number of colds, and sore throats)
decrease in training capacity/intensity
moodiness and irritability
depression
loss of enthusiasm for the sport
decreased appetite
increased incidence of injuries.
a compulsive need to exercise