On what basis to you give this advice? Do you think wifi is preventing sleep, and if so, by what mechanism? Those RF frequencies do not penetrate into the brain.

Wifi absolutely prevents sleep. It does so through a mechanism called "surfing the Internet on your phone in bed." Ditching the wifi and switching to wired Ethernet won't save you from this phenomenon either! The problem is a sleep endangering device that's designed to shoot particles (which also behave like waves) directly into your head! It captures the wifi signal which the device uses to reconfigures its photon emitter, which will disrupt your sleep.

The only solution is to leave your phone on the other side of the room or if you can help it, another room entirely.

But seriously, sleep hygiene is an important aspect of basic hygiene that should be more broadly taught, but isn't.

Wifi definitely prevents my sleep through the Hacker News mechanism.

Just anecdotal. What's the harm in trying it a couple of nights? I was just as skeptical until I tried it. I could link to several fringe studies but what's the point? Nobody serious is going to fund this kind of research. And it's passed the tipping point, how could you find a control group that has not had previous exposure? But of course it does penetrate, it goes through walls.

> But of course it does penetrate, it goes through walls.

Are your walls conductive, eg, largely made of water with various electrolytes? Because otherwise the comparison is senseless. Imagine putting an 8mm or so layer of of skin/fat/bone across each wall. By what factor would that reduce received power on the other side of the wall.

The max power out of a wifi router is 100 mW, that is a tenth of a watt. The amount of power impinging on your body from any reasonable distance will reduce that power quadratically. The amount of power which makes it through your skin and bone to get to your brain, considering it is 2.2 GHz or 5 GHz, is another factor lower.