It depends in your mood, if you have a good modd and feeling good, you can if you are not in a good mood don't. Remember that emotion is one of the factors why we sometimes lose in trading.

Nope. Trade when you are in the good mood.

No. Fortunately, the markets provide many opportunities during each week. You do not need to trade every day if, for instance, you trade on the same weekday or weekdays. Some systems and indicators seem to have a day-of-week effect. S&P futures.