Screen fatigue is physical. Staring at a screen drops your blink rate from about 15 to 4 times per minute, causing dry eyes and headaches. The 20-20-20 rule helps: every 20 minutes, look at something 20 feet away for 20 seconds.

The deeper problem is context-switching. Jumping between tabs and notifications chops attention into shorter spans. Research suggests it can take around 23 minutes to get back to a task after a single interruption.

The fix is time-blocking: give specific hours to specific tasks with notifications silenced. Protect your morning for deep work, and batch email into two or three set windows instead of replying in real time.