Caffeine and trading: how does it affect your sessions?

Caffeine before the London open feels like part of the ritual, but it also adds jitter, impatience and the urge to act. Some traders swear by it; others noticed their worst overtrading happened after a third coffee.

What's your experience?

• how caffeine changes your trading behaviour
• whether you've traded with and without it and compared
• any rules you keep around it

This is a small thing with outsized effects on decision quality.