Friday
Be sure to check markets before the close on Friday. Often the situation
is clearer at the end of the week. In such cases, a better entry or exit can
usually be obtained on Friday near the close than on the following Monday
opening. This rule is particularly important if you are holding a
significant position.
–Jack Schwager, from Schwager on Futures: Technical Analysis
(1996, John Wiley & Sons, New York).