You've probably heard that good sleep is vital for your health. But what I'm about to share will completely change how you think about sleep. It certainly did for me when I first learned this.

Backstory

Let me start with an experience that changed my understanding of sleep, later confirmed by research.

Two years ago, I decided to pick up roller skating with a friend. We bought some skates, watched a bunch of YouTube tutorials, and set out to teach ourselves. After an hour of practice, we hadn’t made much progress—just a bit of balance, but nothing that felt like true improvement. However, something strange happened the next day. I was noticeably better at skating, even though I hadn’t practiced since the previous session.

While the progress was welcome, it was also puzzling. How did I improve without practicing? That’s when I recalled a tweet I’d read not long before. It said, paraphrasing:

The best way to learn something complicated is to read it, analyze it a bit, then sleep. And then come back to it.

Think about it for a second.

The Insight

I connected that tweet to my skating experience. Could sleep be the reason I was improving?

Reflecting further, I realized this wasn't the first time I’d encountered this. While learning to play the ukulele, I’d often struggle with new chords initially. But after sleeping and coming back the next day, I’d perform significantly better.

I shared this thought with my friend, suggesting that maybe our brains keep practicing while we sleep, allowing us to pick up where we left off, only better.

Not long after, I stumbled upon a podcast episode with Joe Rogan and Matthew Walker, a neuroscientist who specializes in sleep. The episode dove deep into the science of sleep and dreams.

And voila!

The Research

Matthew Walker’s book Why We Sleep confirms it: sleep is indeed the reason.

In one study Walker describes, researchers monitored rats as they ran through a maze, tracking their brain activity. When the rats slept, their brains replayed the same memory patterns from the maze—but at 20 times faster!

For me, this explained the improvement in my skating. The patterns I practiced during that hour-long session were replaying 20 times faster in my brain while I slept, resulting in noticeable progress by the next day. While my body was resting, my brain was refining the skill.

Walker’s research shows that quality sleep after practice can boost your abilities by as much as 30% in your next attempt.

Takeaways

When learning something new, don’t be discouraged by slow progress on the first day. Progress doesn’t happen while you're practicing—it happens when you sleep. So, sleep on it, come back, and repeat the process.

This applies to more than just physical skills. In any creative or intellectual task, deep sleep is where real progress happens. It’s no wonder the phrase “sleep on it” is so universal.

If you sacrifice sleep to practice more, you’ll actually take longer to reach your goal; because sleep is 20x faster training. It’s the ultimate performance enhancer.

To learn more about how sleep affects your physical and mental performance, check out the Joe Rogan podcast episode with Matthew Walker. Among other fascinating topics, you’ll learn how much sleep you really need (no less than eight hours) and what you lose when you cut back on it.