If you feel tired all the time — even when you haven’t done much — you might be experiencing mental fatigue caused by overthinking.
Overthinking burns energy
The brain uses about 20% of your body’s total energy.
When it loops through worries, scenarios, and “What ifs,” it’s working overtime.
Signs your exhaustion may be cognitive, not physical
- Constant mental replaying of conversations
- Difficulty making decisions
- Feeling drained despite resting
- Trouble focusing
Why overthinking happens
Often, it’s the brain’s attempt to regain control.
“If I think through every angle, nothing will surprise me.”
(Sadly, this doesn’t work — but the brain keeps trying.)
What helps
- Set a deadline for decisions.
Even small ones. - Practice “good enough” instead of perfect.
Perfection is a myth; “sufficient” is freedom.
Ground your body.
A short walk reduces rumination more effectively than trying to “think your way out.”