This. In summer I get ‘addicted’ to fan noise and cant sleep without. I moved to Asia and the AC is such a blessing.

I grew up near train tracks. I’m totally of incapable of even hearing trains unless they’re directly in front of me.

I noticed I'd feel sleepy after more than half an hour in the server room. Likely the fan noise but the lower temperature might influence it as well.

Unfortunately too expensive and large to set this up in the bedroom to help me sleep nowadays.

It's the dehumidifier for me. Which kills two birds with one stone.

The study may well be flawed—small n, selection bias, lack of proper controls, sure. But can we please stop using personal anecdotes to dismiss scientific inquiry?

Arguments like 'well, it works for me,' or 'I took this med and recovered immediately,' or 'I saw X happen right after a vaccine' are not valid refutations. Science is frequently counter-intuitive and often contradicts our personal experience and gut instincts. That is precisely why we rely on the scientific method and statistical rigor—rather than individual perception—to establish evidence.