The market tends to correct itself. If you are in a losing position and forgot to set a stop loss may as well let it ride until the market returns to a value close to your original position.
I have a journal which shows how this can bite you in the ass. It is not about "forgetting", it is about a plan. If yer a non-US resident, maybe that would work on a CFD, but I cannot trade those. Wish I could.