Your brain is like a muscle The more Meaning Factcheck Usage

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Your brain is like a muscle. The more you use it, the stronger it gets - Tony Robbins
The core message is simple but profound: your cognitive abilities aren't fixed. They can be developed and strengthened through consistent, challenging use, much like building physical muscle through exercise.

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The brain’s memory inbox shuts down when you are sleep-deprived - Matthew Walker
When you don't get enough sleep, your brain loses its ability to form new memories effectively. It's like the "save" function has been temporarily disabled.