First off OP, the number of times one stays in the market/trade doesn't determine how successful and profitable one can be. To even be negative about it, one can lose all week days' trading gains by trading on a weekend. But be that as it may, I don't really see any difference in trading into the weekend. The only nag would be that the market won't be as heavy and active as it would ordinarily be during week days because certain traders would want to go on a vacation or simply stay off the market. Remember the saying, all work and no play makes jack a dull boy? Everyone deserves rest. We don't have to be slaves to money. Work a bit and then take a deserving rest. Ordinarily, weekends should be for family and religious activities.
Many people get into trading because they want to obtain money but many others do so because they want to obtain freedom from their regular jobs, and while it is obvious that the longer you can stay in front of the screen the more profits you will get since you will make on average more trades, at the same time what is the point of becoming such a successful trader if you are going to be staring at your screen all the time and you are not going to be able to do anything else but that?
If you keep on facing your screen the whole time, i think its not healthy anymore. It won't help you to think positively knowing you are abusing your health already. I suggest maybe take weekend as your rest days. You're right, what's the use of a successful trader if you just focus on it the whole time and you're not making any good things for your own? Take a break, and learn to enjoy other things during your rest days. After all, trading during weekends may not seem so healthy because the market itself is not performing well mostly in weekends.
Our bodies need rest, not because we are obsessed with wanting to make big profits, end up spending time just in front of the screen monitoring
the market. The money we make from trading will be in vain, if in the end it is used for medical expenses because our bodies start to have problems.
All work must have time to rest, so for me, weekends should be used for rest. It's enough for me to trade on weekdays, if I use weekends to rest,
then on weekdays my mind is much fresher. If the trading strategy used is good and effective, there is no need to trade on weekends, we can
still generate large profits.