The trap of 'just one more trade' with CFDs

Been trading CFDs for a good while now, mostly indices and some commodities. One lesson I had to learn the hard way, and revisit more times than I'd like to admit, is the insidious nature of overtrading, especially after a decent win or a minor loss. There's this subtle urge, after a profitable scalp on the DAX, to jump straight back in because you feel 'in the zone' or that you've 'got the market figured out'.

I remember one particular session, had two solid trades on $GER30, banked some decent pips. Instead of calling it a day, I saw a setup, felt confident, and went in again. It was a marginal setup, nothing like the clearer entries earlier. Of course, it went against me. Instead of respecting my stop, I narrowed it, then widened it, then got chopped out. Then, the real mistake: immediately re-entering, chasing the loss, convinced it had to reverse. That's when the sizing gets out of whack. What started as a good day ended up giving back all the profits and then some. The P&L wasn't the worst part; it was the mental exhaustion and the realization I'd let a perfectly good day turn sour purely because I couldn't walk away. Discipline around trade quantity and knowing when to just step back is paramount, particularly with the leverage and tight spreads CFDs offer – it's a double-edged sword.