Dr. Matt Walker

It's actually very chaotic, electrical brain activity.

But as we're going into these lighter stages of sleep, then the brain starts to slow down.

And at that point in stage two non-REM, it's maybe going up and down just four to eight times per second.

So a huge deceleration in terms of brainwave activity.

But occasionally you'll get these, so it's going, and then you'll get these beautiful bursts of these sleep spindles.

I actually did, I've never published it publicly, or we did a project called the sonification of sleep.

And we took these electrical signals and then we turned them into sound waves.

And you can actually hear this beautiful sort of...

It's almost this beautiful throbbing of a slowdown in your brain.

And then you'll hear these spindles.

Almost sounds like that beautiful, delicious rolling R in Hindi.

It's just wonderful.

I'm not sure I can do that R. How's it go?

Yeah, not too bad.

Not too bad.

I mean, we're erring on the side of feline, but that's okay, Andrew.

So coming back to, I'm so sorry.

Coming back to sleep, we've gone into light stage two as I'm trying to desperately hold it together.

And we're going down into deeper non-REM sleep.

Now something spectacular happens.