In euphoria (when you are on a winning streak with an undisciplined mind), the feeling element causes you to believe in the certainty that the good times are going to roll on forever. Out of this, the trader drops his guard and begins to trade outside of his trading plan and produces a state of mind that over trades, impulse trades, or revenge trades.
In a trained trader’s mind, the trader maintains an emotional state of disciplined impartiality. The feeling element of this emotional state produces a belief in the certainty that the trader can take advantage of what ever the market is willing to give it. This state of mind is much more conducive to effective trading and can be developed though memory enrichment and symbolic representation.
overtrading also make your winng rate lower and make you at disadvantages from the probability perspective. so from long run, over trading will make you reach a negative expectation on trading results.