Researchers are documenting a new form of workplace fatigue: mental fog after intensive AI use. Difficulty concentrating. Slower decisions. Sometimes even headaches.

A recent study reported in Harvard Business Review surveyed 1,488 full-time US employees working in large companies. Roughly 14% said they had experienced what the researchers call “AI brain fry”—mental fatigue associated with using or supervising AI tools beyond their cognitive capacity.

But the most interesting finding is that AI itself may not be the central problem.

Workers whose jobs required high levels of AI oversight reported 14% more mental effort and 12% more mental fatigue than those doing less oversight. Managing several tools, switching contexts and repeatedly checking AI-generated work appear to place people in a continuous state of evaluation.

You are not quite creating. You are not resting. You are monitoring, correcting and deciding.

That is almost the exact opposite of what a printed book asks of you.

No tabs. No notifications. No competing outputs to judge. Just one thread of attention, held for as long as you choose to hold it.

If fragmented, evaluative attention contributes to AI fatigue, sustained reading may offer a valuable structural counterweight—not because printed books are nostalgic, but because they exercise a different form of attention.

I have spent years in publishing watching this at the level of the object itself. A printed book cannot multitask on you. It cannot send a notification. It does not offer an “accept,” “regenerate” or “revise” button.

It simply waits, asking for one kind of attention at a time—the very capacity our always-on, always-evaluating working lives may be quietly eroding.

No study has yet established printed reading as a remedy for AI-related fatigue. This is an inference from the mechanism researchers describe, not a proven medical conclusion.

But the connection is difficult to ignore.

Perhaps the smartest productivity tool for the AI age is not another app.

It is a chair, a lamp and a book with no Wi-Fi.