I think we are talking about trading right? but even day trading does not mean you have to monitor the market and do analysis throughout the day, of course you need a break and that is important for a trader, stress is very vulnerable to traders, so I think you should have a plan about resting too
Talking about day trading yes. People who do that mostly follow their pumped up coins. Do take it for granted that day traders make all their profit from trading. They make a lot more from selling their picks to a handful of koolaid driven gang ready to support him as a self-proclaimed god.
Stress is obviously harmful to any trader. But being in crypto if you can't handle stress and anxiety then you need to stop trading. Otherwise a better method is long term holding and selling a big pumps.