What are the signs of overtraining?

Overtraining can be signaled by reduced and/or impaired sleeping, eating or desire to train, mood swings and/or diminished results (i.e., slower times, poor or mediocre scores at high intensity). There are infinitely more indicators of overtraining. Be aware of them, and know that you are responsible for understanding them. More is not better here, and rest and recovery are the reasons you improve.

adapted from CrossFit Endurance