What causes mental fatigue? Mental fatigue is complex and usually isn't caused by one thing. Contributing factors can be physical— like poor nutrition, lack of sleep, or hormonal imbalances — or cognitive — you've been asking your brain to do too much.

What happens when your brain gets tired?

It becomes harder to make healthy decisions, stay focused on tasks, and remain calm. It can also become difficult to regulate our emotions. Over time, mental exhaustion can lead to full-blown burnout, physical issues, and stress-related illness.

What does a tired brain feel like?

Cynicism, apathy, lack of motivation, and trouble focusing can all be signs of an overworked brain. If all of this sounds a bit familiar, here are some tips to help you recharge and avoid future burnout.