10 Horrible Things Pulling An All-Nighter Does To Your Brain

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What happens to your body if you stay up all night?

According to health studies, pulling all nighters can lead to health risks. Some of the risks include stroke, sleep deprivation, lack of focus, and low to poor memory…

If HANGRY = hungry + angry, would that mean that SLANGRY = sleepy + angry? Asking for a friend.

But sometimes that just… doesn’t happen. Maybe you’ve got a big exam to study for.

Or maybe you’re all about that party till the breaka-breaka dawn thing.

Or maybe you have a really bad read-the-internet-all-night-long issue.

Either way, pulling an all-nighter can do some funky and awful stuff to your brain. Like these 10 things:

1. You’ll have trouble remembering anything you tried to learn during the day (or night).

When you sleep, a part of your brain called the hippocampus replays what you’ve learned while you were awake, Dr. Charles Czeisler, chairman of the board of the National Sleep Foundation and chief of sleep medicine at Brigham and Women’s Hospital, tells BuzzFeed Life. This helps you encode those things you’ve learned into your long-term memory. No sleep, no long-term memory of those lessons.

And this is why pulling an all-nighter to study for an exam the next day isn’t very smart. “The better strategy would be to read the material during the daytime, and then sleep on it, because then you will actually encode that material into your long-term memory,” Czeisler says.

2. You’ll stay stuck on any complicated problems you can’t figure out.

Let’s say you’re staying up really late working on a problem set that you just can’t crack. The smart thing would be to go to bed now and try again in the morning. During REM sleep, your brain integrates new memories with other memories you’ve previously learned, Czeisler says. This can often result in insight: recognizing patterns and solving problems without even consciously thinking about it. If you pull an all-nighter, you miss out on that sweet, sweet subconscious insight.

3. Your circadian rhythm will be thrown off, making you feel like absolute garbage.

Every cell in your body contains its own circadian clock, and your hypothalamus acts as a master clock that keeps them all running in sync, Dr. Timothy Morgenthaler, president of the American Academy of Sleep Medicine and professor of medicine at Mayo Clinic in Rochester, Minnesota, tells BuzzFeed Life.

All day long, you are sending signals to your hypothalamus. Eating can be a signal, for instance. And light is another major signal, Morgenthaler says. When the hypothalamus receives these signals, it activates the release of hormones in your body that can make you feel hungry, sleepy, and more.

When you stay up all day and all night, though, your signaling gets completely out of wack — you’re seeing light when you shouldn’t be, and you’re eating at weird and unexpected times. That throws your cells’ circadian clocks out of sync, which makes you feel awful: “a vague sense of nausea, fatigue, lassitude, sleepiness,” Morgenthaler says.

4. Toxic metabolic refuse builds up in your brain.

Emiliano / Creative Commons / Via Flickr: loungerie

Your brain burns a TON of energy throughout the day, which results in metabolic byproducts — refuse — left behind. (Think of soot as a byproduct of a car burning gasoline for fuel, Czeisler says; it’s the same idea). Every night, your brain works to repair and restore its neurons. But it can’t do that with all the refuse in the way, Czeisler says.

So every night when you sleep, your brain basically detoxes itself. The metabolites get flushed out through a lymphatic system that runs along the brain’s vasculature (called the “glymphatic system”). But when you don’t sleep, your brain doesn’t get to detox itself, the metabolites build up, and your brain cells don’t get repaired.

5. Your brain legit stops functioning as well as it normally does.

As you stay awake longer and longer, your brain becomes less and less efficient at burning energy, Czeisler says. That’s because your brain uses molecules called adenosine triphosphate (ATP) to help it burn fuel. The longer you stay awake, the more ATP you use, and the less there is left to help you metabolize energy. With less ATP available, you’re not as efficient as you could be.

You need to sleep to replenish ATP molecules. So when you don’t sleep… your brain is not being as efficient as it can be. Meaning it just won’t work as well in some big ways. For instance:

Check out page 2…

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