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Why We Feel Tired After Doing Nothing

Why We Feel Tired After Doing Nothing

Illustration showing a person feeling mentally tired while physically inactive

You didn’t exercise. You didn’t work hard.

Yet somehow, you feel exhausted.

This kind of tiredness is real—and it’s not physical.

Mental Fatigue Is Not Rest

The brain consumes energy constantly.

Scrolling, switching apps, watching videos, and reacting to notifications all require attention.

Resting your body does not always rest your brain.

Attention Is Expensive

Each small decision— what to watch, what to read, what to ignore— uses cognitive resources.

Even passive activities can overload the brain when they require constant micro-choices.

This leads to mental fatigue without movement.

Why It Feels Worse Than Physical Tiredness

Physical fatigue has clear signals.

Mental fatigue is subtle. It builds quietly and lingers longer.

That’s why “doing nothing” can feel more exhausting than activity.

The Takeaway

Feeling tired doesn’t always mean you need sleep.

Sometimes, your brain needs fewer inputs— not more rest.

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