Mental Overload: Why It’s Not Your Workload That’s Breaking You

 

In career coaching, we often focus on workload management. We look at the calendar, the "to-do" list, and the number of unread emails. But for many leaders, the real crisis isn't the number of hours worked—it's the mental overload that never stops.

You know the feeling: you have a "light" day on paper, yet you finish it feeling completely depleted. You aren’t physically tired; you’re experiencing a processing overload. Your brain has reached its limit for holding, planning, and worrying.

The Invisible Weight of Leadership

What we are talking about here is the invisible burden of leadership. While your workload is what you do, your mental load is what you carry. Organisational psychologist Liane Davey refers to this phenomenon as "thoughtload." In her work, she highlights that this strain comes from three main sources: 

• the mental effort of juggling competing priorities, 
• the emotional toll of uncertainty, and 
• the chronic exhaustion of being "on" 24/7.

When your mental overload is high, you aren't just busy—you’re cognitively and emotionally overdrawn. This creates a "psychological drag" that makes even simple decisions feel like a monumental effort. 

Recognising the Signs of Processing Overload

Leaders often ignore these symptoms because they "look" productive on the outside. If you are experiencing the following, you are likely suffering from a peak in your cognitive load: 

• Decision Fatigue: You find yourself deferring simple choices because your "decider" is broken. 
• Persistent Brain Fog: You struggle to find words or recall key details from a meeting that happened just an hour ago.
• Emotional Flatness: You feel numb or reactive rather than empathetic and engaged with your team.
• Constant Anticipation: Your mind is perpetually scanning for the next "shoe to drop," even during dinner or on the weekend.

How to Break the Cycle of Mental Overload

No calendar tool or time-management hack can fix a brain that has no room left to process. To reclaim your capacity, you must transition from managing your time to protecting your mental space.

1. Make the Invisible Visible

One reason mental overload is so draining is that it’s unquantified. Try a "brain dump" at the end of each day. List not just the tasks, but the worries, the concerns, and the unresolved questions running in the background. Getting them out of your working memory and onto paper significantly reduces your background processing load.

2. Close the "Open Loops"

Unfinished business creates the most mental drag. If a decision is 80% there, make it. If a conversation needs to happen, schedule it. As Dr Davey suggests, lowering your own (and your team's) thoughtload often starts with clear expectations and removing the "unproductive conflict" that burns mental energy.

3. Practice "Cognitive Triage"

Not all information requires your deep focus. 

Learn to categorise incoming demands into: 

• High Processing: Requires your best strategic thinking. 
• Low Processing: Routine tasks that can be done with a "tired" brain.
• Noise: Information that you can safely ignore or delegate immediately.

The Bottom Line

True high performance isn't about how much you can fit into a 40-hour (or 60-hour) week. It’s about maintaining the mental clarity to lead with intent rather than just reacting to the noise. By naming the problem—mental overload—and recognising the weight of your internal processing, you can start making the structural changes necessary to lead sustainably.

"What's currently causing 'mental overload ' in your week?"