I really hope sleep is figured out sometime soon. I wish I could just press a button and get a guaranteed restorative sleep.

To deliver these bursts at the peak of the brain’s slow waves, the researchers had to measure each participant’s EEG activity as they slept. This proved challenging because they also needed to measure fMRI signals to monitor CSF flow, and the magnetic fields used for fMRI interfere with EEG signals.

To overcome that, the researchers developed a way to process the EEG signals to eliminate the noise caused by fMRI, very rapidly — in less than 100 milliseconds. To make up for that small lag time in the EEG measurement, they also developed an algorithm that could predict when the slow wave peaks would occur. This allowed them to deliver the pink noise stimulus at the correct time.

That seems like a lot of work to try such an odd idea. What inspired them to try this in the first place?

Interesting.

The auditory stimulus used for this study is a 50-millisecond burst of pink noise. Similar to white noise, pink noise contains all sound frequencies audible to the human ear, but the lower pitch frequencies are louder and the higher pitch frequencies are softer. This creates a balanced, gentle sound similar to steady rain or a distant waterfall.

I wonder if this points to sleeping outdoors / in nature. Wind, night insects?

Sound sample: https://en.wikipedia.org/wiki/Pink_noise

Damn, why does it have to be so complicated?

The most fascinating part to me is that such a small, short sound has a measurable effect.

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