Agreed, we all have faced this some or the other day.
“I can`t sleep” answered the nervous one.
“Why not? Asked the friend.
“I am carrying so much cotton that I cant sleep thinking about it. It is wearing me out. What can I do?”
“Sell down to the sleeping point” answered the friend.
Reminiscences of a Stock Operator by Edwin Lefevre 1923
Never walk into stocks and not know what your exit strategy is.
Chat with Traders Audio/podcast series, EP1, interviewing Jerry Robinson
The 33 Strategies of War by Robert Greene, 2006. (Strategy No.22 : know how to end things, The exit strategy)