10/14/2026
WHAT HAPPENS WHEN YOUR BRAIN’S NIGHTTIME CLEANING CREW GETS INTERRUPTED?
Last night, I woke up in the middle of the night. And instead of simply rolling over and falling back asleep, I made one critical mistake.
I STARTED THINKING.
What do I need to accomplish tomorrow? Did I forget something? What needs my attention?
And just like that, my brain went from REST mode to THINK mode!
Here’s what’s fascinating from a neuroscience perspective.
While we sleep, our brains are doing some pretty incredible housekeeping. The glymphatic system helps clear metabolic waste, while the brain processes memories, regulates emotions, and supports cellular maintenance.
I like to imagine tiny housekeepers inside my brain, sweeping away yesterday’s clutter and preparing everything for a fresh start.
But when I woke up and started mentally organizing my entire life at 3 AM, those poor housekeepers were standing there holding their brooms, waiting for me to GO BACK TO SLEEP!
Why?
Because engaging in worry, planning, and problem-solving can increase activity in the prefrontal cortex, the region behind your forehead involved in executive functioning, decision-making, and higher-order thinking.
That mental activity can increase alertness, making it harder to return to sleep.
And when sleep becomes fragmented, the brain may have less opportunity to complete some of its important overnight restorative processes.
Here’s what I want you to remember:
Your brain doesn’t need you to solve tomorrow’s problems at 3 AM.
It needs you to REST.
So the next time you wake up in the middle of the night, resist the temptation to start planning, analyzing, worrying, or replaying yesterday’s conversations.
Let those little housekeepers keep working!
Sometimes the most productive thing you can do for your brain is absolutely NOTHING.
Your brain is extraordinary. Give it the sleep it deserves.