Busy Brain

A feeling (and now a word) I am very familiar with:

busy brain
n. A mental state that includes racing thoughts, anxiety, lack of focus, and sleeplessness.

Earliest citation:

Medication is swelling his feet and keeping him awake at night, while his mind is under siege from “busy brain”, a side effect of the medication.

—Peter Ellingsen, “Suddenly, there’s nowhere to hide,” The Age, December 10, 2001.

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