As a young trader, I often swung for the fences, creating big win/big loss scenarios. The stress was killing me, but I thought that's what I needed to do.
Funny thing, though, I then started trading smaller and began sleeping better.
Funny thing: my returns improved.
Lesson: Stress distorts judgment. Size determines stress. Eventually, I began trading bigger than ever, but it was a smaller percentage of my net worth, as I diversified and learned all about keeping risk in check.